1、Unit 20 课时跟踪练(四) Lesson 2 & Lesson 3 Language Points一、全练语言点，基稳才能楼高.单词拼写1Poor though they are, the woman still donates (捐送) a lot of money to the Red Cross every year.2The Indians were the original (最早的) inhabitants of North America.3Weve corresponded (通信) for years but Ive never actually met him.4I
2、went to college. Meanwhile/Meantime (与此同时), some of my friends got wellpaid jobs.5The mayor presented (颁发) him with a gold medal at an official city reception.6The 20th century witnessed those breakthroughs (突破) in science and technology.7When I left the hospital I was completely cured (治愈)8He dived
3、 from the bridge and rescued (营救) the drowning child.9She was in a dilemma (困境，窘境) whether to stay at school or get a job.10Shes always been extremely outspoken (直言不讳的) in her criticism of the museums policy.单句语法填空1Although her relatives didnt think she could live for three months, the old doctor fi
4、nally cured her of her disease.2On a rainy day I was riding my bike to pick up my son when a terrible accident happened ahead.3There are a variety of animals ranging (rang) from rabbits to tigers in the park, including a rare species of monkey.4Lost (lose) in reading, he didnt notice someone slide i
5、nto the room. 5I didnt know anybody at the party, but the hostess came to my rescue.6After the long journey, the three of them went back home, _tired (tire)7He gave away all his money to charities, which earned him a good reputation.8Without your help, I would_have_failed (fail) in the exam last wee
6、k.完成句子1We must help to_cure_him_of_stealing.我们必须帮助他改掉偷窃的恶习。2We couldnt_have_finished_the_work_on_time without your help.要是没有你们的帮助，我们就不可能按时完成那项工作。3To make sure that hes in, wed_better_call_him_up_in_advance.为了确保他能在家，我们最好提前给他打个电话。4To our relief, the missing child returned home ten days later, tired_bu
7、t_healthy.让我们感到宽慰的是，那个丢失的小孩子十天后返回了家里，疲惫不堪却很健康。5He was on the point of leaving when_someone_knocked_at_the_door.他正要走，这时有人敲门。6Old folks and children are all against the proposal, not_to_mention the youth.老人和小孩都反对这个提议，更不用说年轻人了。.课文语法填空PIONEERS OF SCIENCEIf you had to choose the single most important dis
8、covery of the 20th century, you would have a real dilemma on your hands. It is possible 1.to_single (single) out a few pioneers of the 20th century. One of the 20th centurys premier scientists 2.was (be) Albert Einstein. In the summer of 1905, this outspoken young man was rocking his oneyearold baby
9、 3.when he was suddenly inspired. “Emc2” was born. 4.Using (use) the most highpowered telescope of the time, Edwin Hubble discovered small areas of mist which were in fact galaxies like our own. Alexander Fleming saw a blue mould in the dish around 5.which the bacteria had been destroyed. This blue
10、mould was in fact the natural form of penicillin. During the Second World War, the US Navy was looking for ways of 6.improving (improve) the accuracy of their missiles. The navy turned to Eckert, an 7.engineer (engine), and Mauchly, a physicist, to wrestle with the problem and produce 8.a machine wh
11、ich was the worlds first computer to do the job. Without the breakthroughs of these pioneers, the world 9.as we know it today would have been a pletely (complete) different place.串点成篇微表达玛丽做过很多不同的工作，从服务员到(range from . to .)电脑程序编制员(programmer)。但这一次她对于这份新工作左右为难(in a dilemma about .)。两天了，她还没有得到面试的结果(out
12、come)，在此期间(in the meantime/meanwhile)她会继续努力工作。她确信她会成功。Mary_has_done_a_number_of_different_jobs,_ranging_from_waitress_to_programmer.But_this_time_she_is_in_a_dilemma_about_this_new_job.She_hasnt_got_the_outcome_of_the_job_interview_for_two_days,_and_in_the_meantime/meanwhile_she_continues_to_work_ha
13、rd.She_is_sure_that_she_will_succeed.二、勤练高考题型，多练自能生巧.阅读理解Theres new evidence that too much screen time early in life can change the circuits (回路) in a growing brain.Scientists disagree, though, about whether those changes are helpful, or just cause problems.The debate centered on a study of young mi
14、ce exposed to a video game.“The mice showed big changes everywhere in the brain，” said researcher Ramirez.On the positive side, it meant that these mice were able to stay calm in an environment that would have stressed out a normal mouse.But it also meant they acted like they had a lack of attention
15、, showed signs of learning problems, and were likely to do dangerous behavior.Generally, the results add to the evidence that parents should be very cautious about screen time for young children, Ramirez said.A more positive explanation came from Professor Leah Krubitzer.“The benefits may be more im
16、portant than the negative sides，” Krubitzer said, adding that a less sensitive brain might succeed in a world where overstimulation (过度刺激) is a common problem.Its true that this sort of stimulation may make a childs brain less sensitive in some ways.But it also may prepare the brain for an increasin
17、gly fastpaced world.“Less than 300 years ago we had an industrial revolution and today were using mobile phones and we interact (互动) on a regular basis with machines，” Krubitzer said.“So the brain must have changed.”Krubitzer rejected the idea that the best solution is to turn_back_the_clock.“You ar
18、e likely to think of the good old days when you were a kid, and say, I didnt do that and I didnt have TV and look how great I turned out，” Krubitzer said.Brain researcher Gina Turrigiano thinks lots of screen time may be fine for some young brains, but a problem for others.“Parents have to really re
19、alize the fact that each kid is going to respond very differently to the same kinds of environments，” she said.语篇解读：本文是议论文。电子屏幕对孩子的大脑发育有损害，但同时也被这个高速发展的科技社会所需要。1What damage did the screen time cause to the mice?AThey have difficulty in focusing.BThey are no longer afraid of danger.CThey change their
20、nature completely.DThey get used to a stressful environment.解析：选A细节理解题。由第二段“ .they acted like they had a lack of attention, showed signs of learning problems, and were likely to do dangerous behavior.”可知，这些老鼠的注意力下降，出现了学习障碍，以及有危险行为倾向。2Why do kids today need screen time according to Krubitzer?AThey ar
21、e too sensitive to changes.BThey learn how to succeed from it.CIt is needed in social development.DIt protects them from overstimulation.解析：选C细节理解题。由第四段“But it also may prepare the brain for an increasingly fastpaced world.”可知，电子屏幕虽然有害，但是这个高速发展的科技社会需要大脑也做出一些改变来适应。3What does the underlined part “turn
22、 back the clock” in Paragraph 5 mean?AStay away from screens.BForget the good old days.CBehave younger and healthier.DChange the time shown on the clock.解析：选A词义猜测题。由画线部分之后的“.think of the good old days when you were a kid .I didnt do that and I didnt have TV and look how great I turned out”可知，turn ba
23、ck the clock意指回到过去没有电子屏幕的生活。4What does Gina suggest parents do in the last paragraph?ALearn more from each other.BDont limit screen time for their kids.CBe cautious about screen time for their kids.DEncourage their kids to learn more from screens.解析：选C推理判断题。由最后一段Gina说的话可知，相同的面对屏幕的时间对于不同的孩子来说影响也不同，所以
24、父母们不能轻率地做出决定。.语法填空Millions of Americans are mourning (哀悼) the death of astronaut John Glenn, who passed away _1_ (peaceful) on December 8, 2016 at the age of 95.President Donald Trump said, “The US has lost a great pioneer in space travel.”Glenn _2_ (start) his flying career as a fighter pilot.In 19
25、59, Glenn became one of seven test pilots _3_ (choose) to take part in the first space program of the US.Glenn rose to fame in 1962 when he became the first American _4_ (circle) the Earth in a spaceship.The journey made him _5_ American hero.As a member of the Democratic Party, Glenn first won the
26、election to the Senate (参议院) in 1974 and served for 24 years _6_ January 3, 1999.Glenn was known for his modesty, refusing to see _7_ (he) as a hero.He preferred to focus on his work, saying, “The greatest people are those _8_ devote themselves to something _9_ (important) than merely their own self
27、interest.”On October 29, 1998, when Glenn was 77, he returned to space and stayed there for nine days, thus _10_ (set) the record for being the oldest person in space.语篇解读：本文是说明文。2016年12月8日，美国首位绕地球飞行的宇航员约翰格伦辞世，享年95岁。富有传奇色彩的是，他创下了两次太空飞行间隔最长、年龄最大的宇航员纪录。1peacefully空白处所填词在句中修饰谓语动词，需用peaceful的副词形式。2start
28、ed此处陈述过去事实，故用一般过去时。3chosenchosen to take part in the first space program of the US是过去分词短语作定语，修饰seven test pilots，分词动作choose与被修饰词之间是被动关系。4to circle序数词或由序数词修饰的名词后常用不定式作定语。5anan American hero意为“一位美国英雄”。6until/till句意：Glenn于1974年首次当选参议员，从政24年，直到1999年1月3日。7himself这里指的是Glenn自己本人，故用he的反身代词。8who先行词为those，定语从句中的关系代词通常用who。9more important由空后的“than”可知，此处应用important的比较级形式。10settingthus setting the record for being the oldest person in space是现在分词短语作状语，表示结果，分词动作set与逻辑主语he之间是主动关系。
