1、(一)课前自主学习.阅读单词知其意1cave n洞；山洞2peak n. 山顶；山峰3plain n. 平原4plateau n. 高原5shore n纵联1 (海、湖、河等的)岸6slope n. 斜坡7valley n纵联2 山谷8downstream adv. 向下游；随波而下9temple n. 寺庙10dock n. 码头vi. 驶入码头11raft n. 木筏 12detour n. 迂路；绕行之路13legend n. 传奇；传说故事14deck n. 甲板15exploit vt. 开发16cruise n. (乘游轮的)漫游；巡航17cabin n. 船舱；机舱18loung
2、e n. 休息室；休息厅19fertile adj. 肥沃的.重点单词写其形1wood n. (常作复数)树林2flat adj. 平坦的3colleague n纵联3 同事4goods n. 货物5trade vi. 做生意6narrow vi. 变狭窄；缩小7remote adj. 遥远的8steep adj. 陡峭的；险峻的9spot n. 地点；场所10view n. 景色；风景11immense adj. 极大的.拓展单词通其变1surround vt.围绕；环绕surrounding adj.周围的surroundings n环境；周围的事物2distant adj.遥远的；冷淡的
3、；疏远的distance n距离；远方3forbid vt.禁止forbidden adj.被禁止的；不准的4mountainous adj.多山的mountain n山；山脉5varied adj.多变化的vary vi.变化；变更various adj.各种各样的variety n种类；多样性6naturally adv.自然地natural adj.自然的nature n自然；天性纵联1. “岸边”来聚会shore(海、湖、河等的)岸beach海滩coast海岸 bank岸seashore海岸；海滨纵联2.一“山”更比一“山”高valley山谷 peak山顶；山峰mountain山；山脉
4、 hill小山range山脉纵联3. “朋友圈”不断扩大colleague同事 fellow同伴；伙伴netpal网友 roommate室友，舍友companion同伴；同事；伴侣 partner伙伴；同伴penpal笔友 friend朋友单元话题旅游子话题1旅行类型journey n(长途)旅行，行程 tour n参观，观光，旅行trip n(短途)旅行，旅程 voyage n航行，旅行outing n郊游，远足 selfdriving travel自驾游子话题2旅游景点destination n目的地，终点 scenery n风景，景色，风光castle n城堡 museum n博物馆，博
5、物院palace n宫，宫殿 pyramid n金字塔aquarium n水族馆 fountain n喷泉monument n纪念碑，纪念塔 a summer resort避暑胜地a place of interest名胜 a mustsee place必游之地学考对接活学活用高考采撷(一)阅读中的词汇应用1(2017江苏高考阅读D) Elsewhere in Asia even more astonishing actions are being taken.Chewang Norphel lives in a (mountain) region in India, where he is
6、known as the Ice Man.The loss of glaciers (冰川) there due to global warming represents an enormous threat to agriculture.Without the glaciers, water will arrive in the rivers at times when it can damage crops.用mountain的正确形式填空：mountainous写出enormous在本单元中的近义词：immense2(2011北京高考阅读D) As the railroads and t
7、he highways shaped the American West in the past centuries, a new electrical generating (发电) and transmission (输送) system for the 21th century will leave a lasting mark on the West, for better or worse.Much of the real significance of railroads and highways is not in their direct physical effect on
8、the scenery， but in the ways that they affect the (surround) community.The same is true of big solar plants and the power lines that will be laid down to move electricity around.So tradeoffs will have to be made.Some scenic spots will be sacrificed.Some species (物种) will be forced to move, or will b
9、e carefully moved to special accommodations.Deals will be struck to reduce the immediate effects.写出scenery在本单元中的近义词：view用surround的正确形式填空：surroundingspot在句中意为：地点，场所；此外还可用作名词，意为：斑点；污点；用作动词意为：发现；认出；弄脏高考采撷(二)写作中的词汇应用(根据汉语及提示词翻译句子)1(2018江苏高考书面表达)但我得到的信息是丰富多样的，甚至是矛盾的。(varied)But_the_information_I_got_was_
10、rich_and_varied,_or_even_contradictory.2(2017全国卷书面表达)此外，还有一些著名的艺术家将会在现场表演如何剪纸。(spot)In_addition,_there_are_famous_artists_who_will_perform_how_to_cut_paper_on_the_spot.3(2017北京高考书面表达)在我看来，我更喜欢长江之行，长江是中国最长的河流，也是中国文明发源地之一。(view)In_my_view/From_my_point_of_view,_I_prefer_the_tour_along_the_Yangtze_Rive
11、r,_the_longest_river_and_one_of_the_mother_rivers_of_Chinese_civilization.(二)课堂重点释疑1forbid vt.(forbad/forbade, forbidden, forbidding) 禁止；不准记牢(1)forbid doing sth.禁止做某事 禁止某人做某事(2)forbidden adj. 被禁止的；禁用的练通单句语法填空He was forbidden to_leave (leave) the house, as a punishment.It is high time that we forbade
12、 setting (set) off fireworks in urban areas.He forbade me from meeting my friends online at the Internet caf！一句多译禁止孩子们过度玩手机是他们父母的责任。It is their parents duty to forbid_the_children_to_play mobile phones excessively.It is their parents duty to forbid_the_children_from_playing mobile phones excessively
13、.用准(1)forbid后不能直接跟动词不定式作宾语，但可直接跟动名词作宾语，也可用forbid sb.to do sth.形式。(2)与forbid用法类似的动词还有：allow, advise, permit等。写美翻译句子如果我们禁止使用塑料袋，我们应该找到解决问题的方法。If_we_forbid_using_plastic_bags,_we_should_find_ways_to_solve_the_problem.2spot n地点；场所；斑点；污点v.发现；认出；弄脏辨清写出下列句中spot的含义The floor was spotted with paint, which mad
14、e him embarrassed.弄脏Some of the spots on your trousers are hard to remove.斑点；污点I read through the first page of the book and spotted a spelling mistake.发现Fortunately, a man made an offer to take him around the different spots.地点；场所记牢(1)spot sb.doing sth.发现某人正在做某事on the spot 在现场；当场；立即in a spot 处于困境(2
15、)be spotted with 满是斑点；点缀着练通单句语法填空Spotted shopping (shop) shoulder to shoulder with a girl, I felt very embarrassed.I wish our government could set up more free WiFi spots where we can have access to the Internet on our phones.补全句子James was called to see the producer and got the job on_the_spot.詹姆斯被叫
16、去见制片人，当场就得到了那份工作。用准spot作“地点”讲，用作定语从句的先行词时，从句如缺状语则用where引导定语从句，从句如缺主语或宾语则用that/which引导定语从句。写美翻译句子(2017北京高考书面表达)此外，长江沿岸的风景也令人惊叹，有许多著名的观光景点。Moreover,_the_scenery_along_the_Yangtze_River_is_amazing,_with_many_wellknown_sightseeing_spots.3view n景色；风景；观点；见解；视野vt.把视为；观看；注视；考虑辨清写出下列句中view的含义People came from
17、 all over the world to view her work.观看If we sit near the front of the bus, well have a better view.视野He climbed up to the top of the church tower to get a better view of the entire city.景色In this lecture, I can only give you a purely personal view of how we can live life to the full.观点；见解记牢(1)come
18、into view映入眼帘；进入视野in view 在视野范围内have a good view of 清楚地看到；饱览(2)in view of 鉴于；考虑到in ones viewfrom ones point of view 在某人看来(3)view .as . 把看作练通单句语法填空When the old man opened the window, a stranger with a high hat came into view.When the car was first made, the design was viewed as highly original.In vie
19、w of the shortage of time, each person may only speak for five minutes.She waited until the whole island was in view and then took a photo.写美翻译句子(2017北京高考书面表达)在泰山之巅，你可以饱览美丽的日出。On_the_top_of_Mountain_Tai,_you_can_have_a_good_view_of_the_beautiful_sunrise.词汇过关综合训练.单词拼写1Cheap goods (货物) are available,
20、but not in sufficient quantities to satisfy demand.2Hardly had she walked out of the woods (树林) when she heard the strange scream coming from behind a tree.3He was not only talented but also popular with his colleagues (同事)4Having settled in that remote (遥远的) area for a year, the young man finally a
21、dapted to the weather.5It used to be thought that the Earth was flat (平坦的)6The water was quite shallow but where the reef ended, there was a steep (陡峭的) drop to the sandy ocean floor.7Smoking is harmful to health.It should be forbidden (禁止)8Developing foreign trade (贸易，交易) is very important for our
22、country.单句语法填空1The key is to develop a balanced and varied (vary) program that is fun as well as progressive.2The highanxiety focus on reading score may have narrowed (narrow) students access to knowledge about the world that can improve their reading.3If you stand here, youll get a better view of t
23、he river.4They trade with the local villagers to make a living.5We should take measures to forbid returning (return) illegal cooking oil to dinner tables.6When he returned home on a rainy day, his boots were_spotted (spot) with mud.7The travellers in the desert saw in the distance (distant) a lake a
24、nd trees growing beside it, but they didnt exist actually.8Our class are going to visit poor children in a remote mountainous (mountain) area this weekend.根据提示补全句子1在我看来，为了增强体质，我们应该养成健康的饮食习惯。(view)In_my_view,_we should develop healthy eating habits to build up a strong body.2那个年轻人在抢一位女士的项链时被发现了，警察当场逮
25、捕了他。(spot)Caught robbing a lady of her necklace, the young man was arrested on_the_spot by a policeman.3火车开动时，我们被禁止将头伸出窗外。(forbid)We were_forbidden_to_stick_our_heads_out_of the window when the train was moving.4我住在一座古老的城镇里，城镇的四周都是美丽的树林。(surround)I live in a very old town (that/which_is)_surrounded_
26、by/with_beautiful_woods.5在现代，很多年轻人喜欢在网上与他人做生意。(trade)In modern times, many youths like_trading_with_others on the Internet.(一)课前自主学习1at_the_edge_of在的边缘2have_four_weeks_off 休四周假3at_least 至少4go_through串记1 通过；经历；仔细检查5be_heavy_with 串记2 有大量的；充满6take_advantage_of 利用7in_the_distance 远处的8rip_off 敲竹杠；敲诈9get_
27、a_kick_out_of (俚语)从中得到乐趣10all_the_way 一路；一直；自始至终同根短语串记串记1.“v.through”短语多棱镜go through经历；穿过 get through用完；耗尽pull through康复；痊愈 see through看透；识破break through冲破；突破 glance through匆匆看一遍串记2.“充满”短语荟萃be heavy with充满 be filled with被充满be full of充满 fill up充满；填满be crowded with充满；挤满1a teacher training college 教师进修
28、学院2the construction site 建设工地3the Spring Festival 春节4take a boat downstream 乘船顺流而下5show ones passport 出示某人的护照6get on/off boat 上/下船7take pictures 拍照8make a prediction 预测9geographical features 地理特征10follow the rules 遵循这些规则1He and a colleague were_to_spend two years there teaching English at a teacher
29、training college.他和一位同事将在那里的一所教师进修学院教两年英语。2Nearly 100 million people live here, most_of_them_in_the_east.有将近一亿人口住在这儿，这些人大多数住在东部。3Im allowed to stick one in only_if Ive been in a place for more than 24 hours.只有当我待在一个地方超过24小时，我才允许自己扎一个别针在地图上。学考对接活学活用高考采撷(一)完形中的短语(补全句子)1(2017全国卷完形填空) I myself went_thro
30、ugh (经历) this searching process and found something that has changed my experience at college for the better: I discovered ASL American Sign Language (美式手语)2(2015天津高考完形填空) Although her description sounded wonderful, the price was beyond our range, so we declined.But she kept urging us to have a look
31、 at_least (至少)高考采撷(二)写作中的短语和句式(补全句子/词汇升级)1(2018北京高考书面表达)在我看来，你一定会从中国文化中得到乐趣。In my opinion, you will certainly get_a_kick_out_of Chinese culture.2(2017浙江高考写作)很快，狼跑开了，消失在远处。Soon, the wolf ran away off the road and disappeared in_the_distance.3(2016江苏高考书面表达) Thirdly, the voters or even the competitors
32、in many cases are possibly made use of by the organizers for commercial purposes.(用本单元短语替换加黑词)taken_advantage_of4(2014湖北高考写作)通过我多年的学校生活，我明白了如果我们要想改变生活，从小事做起是至关重要的。(be to do sth.)Through my years of school life, Ive learned that if we are_to_make_a_difference in life, its vital that we should begin w
33、ith small things.(二)课堂重点释疑短语集释1go through通过(考试、法案等)；经过(某场所)；经历；详细检查；查看；完成；用完；耗尽辨清写出下列句中go through的含义I had to go through a lot of difficulties to become strong enough to solve it.经历Our plan on how to spend our summer holidays didnt go through.通过As you go through this book, you will find that each of
34、the millions of people who lived through World War had a different experience.完成He went through his pockets looking for the keys.详细检查；查看记牢go after追求；追逐go by 过去；流逝go on (with) 发生；继续下去go against 不利于；违背；反对go up 上升；增长；升起go over 复习；重温；仔细检查go out 熄灭；过时；出去练通选用上述短语填空I was reading magazines in the room when
35、all of a sudden the light went_out.Being a winner doesnt mean youll always get everything you want, but it does mean youll go_after your goals in ways that are reliable.Our teacher chose many important exercises for us, and I went_over the language points at the same time.写美翻译句子无论我们经历了多少困难，如果我们不放弃，我
36、们就能克服它们。No_matter_how_many_difficulties_we_might_go_through,_we_can_overcome_them_if_we_dont_give_up.2get a kick out of (俚语)从中得到乐趣记牢(1)for kicks为了追求刺激(2)kick against 抱怨；反对kick off (足球)开赛/球；脱掉；开始kick away 不断地踢；踢开kick out 撵走；开除kick the habit of 戒除的习惯练通选用上述短语填空I dont expect to win when I bet I do it fo
37、r_kicks.I cant believe that Glens wife kicked him out.As the jobhunting season kicks_off,_many graduates are suffering from anxiety.My brother gets_a_kick_out_of collecting coins and he has got a very large collection.写美补全句子这项旨在帮助人们戒掉吸烟习惯的协议是在两年前签署的。The agreement, intended_to_help_people_kick_the_ha
38、bit_of_smoking,_was signed two years ago.句式集释be to do sth.教材原句He and a colleague were_to_spend two years there teaching English at a teacher training college.悟拓展例句(1)You are_to_arrive_at_the_spot before five this afternoon.你们将要在今天下午五点钟以前到达现场。(2)All the drivers are_to_follow the traffic regulations.所
39、有的司机必须遵守交通规则。(3)The invention of the Internet is_to_change_the_way we communicate with each other.互联网的发明注定要改变我们相互交流的方式。(4)Colin was_about_to get off the camel when a child ran towards him.科林正要从骆驼上下来， 这时一个小孩向他跑来。(5)So if you are_going_to_visit a friend, it is necessary to make a reservation.所以，如果你要去拜
40、访一个朋友，有必要预约一下。析用法规则用法归纳(1)be to do sth.表示“按照计划或安排将要做某事”。 (2)be to do sth.意为“应该/必须做某事”。长辈要求晚辈或上级要求下级做某事时常用此句型。(3)be to do sth.表示不可避免将要发生的事或命中注定的事。(4)be about to do .表示“即将发生的动作”。 (5)be going to do .多用于口语，强调事先打算、计划要做某事或根据某种迹象要发生某事。注意事项be about to do .表示“即将发生的动作”，不与表示时间的副词或其他时间状语连用，常用于be about to do .wh
41、en .，意为“正要做这时”。背写作佳句(1)We were to have visited the Great Wall yesterday, but it rained.(要点句)(2)We were about to leave when an old man asked us which school we were in.(要点句)词块、句式过关综合训练.选词填空rip off， take advantage of， be heavy with， at the edge of， go through， at least， get a kick out of， all the way1
42、Learning is a difficult task, but we can get_a_kick_out_of it.2Even if you cant help him, at_least you can give him encouragement.3How does she keep smiling after all the hardships she has gone_through?4The New Year is coming.The air is_heavy_with joy and smell of fireworks.5Some seafood restaurants
43、 near the seaside make illegal money by ripping_off tourists.6Now, on the special night, I stayed in the shadows at_the_edge_of the crowd waiting for the winning ticket to be drawn.7Judging things from as many sides as possible is a skill that needs improving all_the_way.8Dont limit yourself to your
44、 college alone take_advantage_of all available resources.根据提示补全句子/句型转换1当格林先生年迈时，他从饭后散步中得到了很多乐趣。(get a kick out of)Mr Green got_a_kick_out_of_going_for_a_walk_after_dinner when he was old.2以你自己的速度学习和写作你不必匆忙因为你有一年的时间来完成这个项目。(go through)Study and write at your own pace you do not have to rush as you ha
45、ve a year to go_through_the_project.3很多专家参加了这次会议，其中大多数来自美国。(独立主格结构)Many experts attended the conference, most_of_them_from_the_United_States.4All guests must check out by 9：30 am on the day of their departure.All guests are_to_check_out by 9：30 am on the day of their departure.(be to do sth.)5You ca
46、n be allowed to go on holiday with your friends only if you have passed the examination.Only_if_you_have_passed_the_examination_can_you_be_allowed to go on holiday with your friends.(倒装句式).读后续写阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。From hanging out with friends in the nearby coffee shop to daydreaming of “ma
47、king it big” as a rock star, the last few years has been a rollercoaster ride. I am tormented (折磨)with questions such as who I am and what I am doing here.During the last year at school, I took up the challenging task of directing the_English_play for the Annual Inter House Dramatics Competition. Th
48、e task was said to be very long and tiring but equally rewarding. After several discussions with my vicecaptain and my_English_teacher,_the play was selected and the cast was confirmed. I thought of “perfect ideas” such as the “perfect delivery of certain dialogues” and the “perfect effects”I discus
49、sed my ideas with my crew and vicecaptain. Everybody seemed pleased with thoughts and also suggested a few. I took these into careful consideration and made sure that my crews suggestions were included. But little did I know that my “perfect_plan” was not perfect according to my English teacher who
50、was in charge of my house. Even though it was supposed to be a completely studentbased activity, my English teacher poked her nose into the production.All of us wanted to win and this was made very clear by my English teacher. She changed our entire plan into something we could not understand. There
51、 was a lot of confusion among the actors and the crew. I was torn between listening to the complaints of the fellow students and obeying my teacher. But soon I realized that the way we were practicing would lead us nowhere.So, the next morning, I gathered all my courage,_practiced what I was going t
52、o say to her and finally made the journey of my life to the_staff_room. I discussed with my teacher about the confusion being caused, the unsatisfied actors and how her interference (干预) was causing frustration.注意：1.所续写短文的词数应为150左右；2至少使用5个短文中标有下划线的关键词语；3续写部分分为两段，每段的开头语已为你写好；4续写完成后，请用下划线标出你所使用的关键词语。P
53、aragraph 1：As I waited for my teacher to reply, I prepared myself for the blow. Paragraph 2：Though we came second in the English play competition, I realized I had got more out of the whole experience than I had hoped for. 写作步骤第一步：速读全文文本大意：本文是记叙文，讲述了我在一次英语戏剧表演赛前，面对老师的干预学会解决问题终获成功的故事。叙述意图：文章告诉我们做事要有自
54、己的主见。第二步：细读全文1所给短文情景模式分析。whoI, my English teacher, crewwhatI took up the challenging task of directing the English play.whenduring the last yearwhereat schoolwhyMy English teacher poked her nose into the production.2对原文所提供的下划线词语进行分类。人物：my English teacher, crew事件：the English play, perfect plan, the s
55、taff room动作与心理描写：daydream, pleased, realize, confusion, courage第三步：精心谋篇1Paragraph 1：As I waited for my teacher to reply, I prepared myself for the blow.当我在等待老师的回答时，我准备接受老师对我的打击。情节分析由段首句中的关键词waited for, reply, prepared可知，接下来应该是围绕我的老师的反应来写。2Paragraph 2: Though we came second in the English play compet
56、ition, I realized I had got more out of the whole experience than I had hoped for.尽管我们在这次英语戏剧比赛中得了第二名，但我意识到我从这次经历中获得的东西超出了我原来希望的。情节分析由转折关系词“Though”可知，此段重点在后半句内容上，即我的收获。因此，接下来的内容就是具体描写作者在整个经历中的收获。第四步：初写成文Paragraph 1：1她只是微笑着说我做得很好，引起了她对这件事的关注。She just smiled and said that I had done a good thing that
57、brought this to her attention.2晚上，她召开了一个会议，告诉大家继续之前的计划，并说这是一个以学生为基础的作品。In the evening she called a meeting and told the crew to_continue_with_previous_plans and said that it was a studentbased production.3当她离开时，她告诉我们说我们的“完美计划”应该让我们赢得第一名。As she left she told us that our “perfect_plan” should make us
58、win_first_place.Paragraph 2：4我意识到我有勇气面对问题。I realized I had_the_courage_to_face problems. 5作为团队工作者，我有抗压能力。I could work under_pressure as a team worker.6现在我仍然去拜访我的英语老师，而且每次见到她，她的脸都会让我想起那次去教师办公室的可怕的路程。Now I still visit my English teacher and each time I see her, her face reminds_me_of that terrifying w
59、alk to the staff room.第五步：润色升级1用分词短语作定语改写要点1。She_just_smiled_and_said_that_I_had_done_a_good_thing_bringing_this_to_her_attention.2将要点4和要点5合并为一个并列句。I_realized_I_had_the_courage_to_face_problems_and_I_could_work_under_pressure_as_a_team_worker.3把要点6中的visit改为名词形式。visitpay_a_visit_to第六步：复查定稿Paragraph 1
60、：As I waited for my teacher to reply, I prepared myself for the blow. But she just smiled and said that I had done a good thing bringing this to her attention. In the evening she called a meeting and told the crew to continue with previous plans and said that it was a studentbased production. As she
61、 left she told us that our “perfect_plan” should make us win first place.Paragraph 2：Though we came second in the English play competition, I realized I had got more out of the whole experience than I had hoped for. I realized I had the courage to face problems and I could work under pressure as a t
62、eam worker. Now I still pay a visit to my_English_teacher and each time I see her, her face reminds me of that terrifying walk to the_staff_room.理清句间结构之(一)总分一般来说，段落的首句常是主题句，起到总领的作用，后面句子是对主题句的论证和分析，有时通过引用一些句子进行说明。利用句子间的这种“总分”关系，可准确解答阅读七选五类题目。高考典例12018全国卷阅读七选五Before there was the written word, there w
63、as the language of dance. Dance expresses love and hate, joy and sorrow, life and death, and everything else in between._36_ We dance from Florida to Alaska, from north to south and sea to sea. We dance at weddings, birthdays, office parties and just to fill the time.ASo why do we dance?BDance in th
64、e US. is everywhere.CIf you like dancing outdoors, come to America.DMy older students say it makes them feel young.EI keep practicing even when Im extremely tired.FDancing seems to change their feeling completely. GThey stayed up all night long singing and dancing.由位置可知36题为主题句，为总，根据其后的细节支撑句“We dance
65、 from Florida to Alaska, from north to south and sea to sea. We dance at weddings, birthdays, office parties and just to fill the time.”可知，舞蹈在美国无处不在。B项符合要求。高考典例22017全国卷阅读七选五Lots of people find it hard to get up in the morning, and put the blame on the alarm clock. In fact, the key to easy morning wa
66、keup lies in resetting your body clock._16_ Heres how to make one._17_ In order to make a change, you need to decide why its important. Do you want to get up in time to have breakfast with your family, get in some exercise, or just be better prepared for your day? Once you are clear about your reaso
67、ns, tell your family or roommates about the change you want to make.Rethink mornings .Keep your sleep/wake schedule on weekends .Keep a record and evaluate it weekly .AGet a sleep specialist.BFind the right motivation.CA better plan for sleep can help. DAnd consider setting a second alarm.EIf the st
68、eps you take are working, keep it up.FStick to your set bedtime and wakeup time, no matter the day.GReconsider the 15 minutes you spend in line at the cafe to get coffee.第16题空格前一句为主题句，为总，介绍了早上起床变得简单的关键是重新设置生物钟，后一句为细节支撑句，提出要制定一个调节计划，因此得出第16题的答案为C项。由位置可知17题为主题句，为本题的总；根据后面的细节支撑句“In order to make a chan
69、ge”和“Once you are clear about your reasons”可以断定B项为正确答案。高考典例32016全国卷阅读七选五_38_ Fresh fish should smell sweet: you should feel that youre standing at the oceans edge. Any fishy or strong smell means the fish isnt fresh. _39(A)_ When you have bought a fish and arrive home, youd better store the fish in
70、the refrigerator if you dont cook it immediately, but fresh fish should be stored in your fridge for only a day or two. Frozen fish isnt as tasty as the fresh one.A.Do not buy it.BThe easiest is to steam it.CThis is how you can do it.DIt just requires a little knowledge.EThe fish will go bad within hours.FWhen buying fish, you should first smell it. GThe fats in fish are thought to help prevent heart disease.第38空考查段首主题句。根据段落中提供的细节：围绕如何通过嗅觉来鉴别鱼是否新鲜，由此可以推出F项为本段的主题句，意为“买鱼时应该先闻一闻”。
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