1、Unit 21 Human Biology课时作业15Lesson 3Epidemics Explained.单词拼写1My doctor gave me a _(细致的) checkup.2The mouse is on _(试验)3I happen to have the official _(统计数字) with me.4They did it as a matter of _(惯例)5In a company, _(协作) is very important.6There is an _(严重的) shortage of skilled labour in this area.7Lif
2、e in the _(都市的) areas is very different from that in the village.8They will _(重建) the library, so we expect it can attract more attention.9We should have _(信任) in our life in the future.10No one can _(预见) what well be like in the future.答案1thorough2.trial3.statistics4.routine5teamwork6.acute7.urban8
3、.rebuild9faith10.foresee.用适当的介、副词填空1Dont refer_your notes while delivering the speech.2This disease is harmful_your skin.3The drought led_the reduction of the crops.4He spent_to ten days on that deserted island.5He was careless to leave_a key word in the test.6He went through a lot of hardships, but
4、 he succeeded_time.7A lack_money forced him to return home.8We tried to wipe_poverty.9The old have no defence_the disease.10Her father died_heart attack.答案与解析1torefer to 查阅，谈及，提到。2tobe harmful to 对有害。3tolead to 导致。4upup to 多达。5outleave out 遗漏。6inin time 最终。7ofa lack of 缺乏。8outwipe out 消灭。9againstdef
5、ence against 抵抗。10ofdie of 死于。.用所给词的适当形式填空1He bought a_(refer) book in this bookshop.2The sick boy received good_(treat)3He found a_(solve) to the problem in the end.4They strengthened the_(defend) works.5There is a_(tend) that the price of houses is going down.6The_(adapt) of the new policy is bene
6、fical to the old.7The beautiful scenery was_(impress) and attractive.8The flood badly_(effect) our normal life.9We need to have more_(communicate) with our children.10We get news through varieties of_(medium)答案1reference2.treatment3.solution4.defence5tendency6.adaptation7.impressive8.affected9commun
7、ication10.media.单句语法填空1The natural disaster left the people_(suffer) a lot.2We had to accept the fact_many families suffered from the poverty.3The doctor found a cure_the new virus and cured a lot of patients_their illnesses.4With her parents_(help) her, she got over the hardship.5Since she _(leave)
8、 the village in 1980, I havent heard of her.6The number of the people who have died of the new virus_(go) up at present.7Since two years ago, Mr Smith_(do) research on this plant.8_is often the case, he didnt appear as he had promised.9The disease is believed_(be) the most severe cause of the death
9、rate over the past few years.10He attempted_(pass) the driving test but failed.答案与解析1sufferingleave sb. doing sth.让某人做某事。2thatthat 引导同位语从句，无意义，也不充当任何句子成分。3for; ofa cure for的疗法；cure sb. of sth.治愈某人的。4helpingher parents 与 help 之间为主动关系，故用现在分词作宾补。5leftin 1980与一般过去时连用。6is goingthe number of.作主语，谓语动词用单数形式
10、，at present 与现在进行时连用。7has been doingsince two years ago 与现在完成时连用。8Asas is often the case 情况正是如此。9to have been根据 over the past few years 可知用不定式的完成式。10to passattempt to do 努力做。.语法填空There is a_1_(tend) that the young pour into big cities to seek work. They want to wipe _2_poverty in the country. They l
11、eft their families _3_(wait) for them eagerly at home. Various _4_(medium) have reported the fact _5_a lot of children _6_parents go to work in cities suffer from loneliness and lack of love, which led _7_a great many social problems. with their grandparents _8_(look) after them, the children lack t
12、he love and care from their parents. As a consequence, they lack faith in themselves and have no defences _9_bad effects from society. It is _10_(harm) to their growth. Therefore, we appeal to the young parents should pay attention to caring for their children. Money alone cant bring them happiness.
13、答案与解析1tendencytendency 倾向。2outwipe out 消灭。3waitingleave sb. doing sth.让某人做某事。4mediavarious 后跟复数名词。5thatthat 引导同位语从句，无意义，也不充当任何句子成分。6whosewhose 引导定语从句，在从句中作定语。7tolead to 导致。8lookingtheir grandparents 与 look 之间为主动关系，故用现在分词形式作宾补。9againstdefence against 抵抗。10harmfulbe harmful to 对有害。.阅读理解“Climate change
14、 connected with the reduction of wetlands at the source of the countrys two longest rivers，the Yangtze and the Yellow, has reduced the volume of water flowing into them，” scientists said.Scientists studied changes over the past 40 years to the wetlands on the cold QinghaiTibet Plateau in west China
15、where the two rivers have their sources.They found the wetlands on the plateau have shrunk(减少) more than 10 percent over the past four years. The wetlands at the source of the Yangtze have suffered the most，decreasing by 29 percent.“About 17.5 percent of the small lakes at the source of the Yangtze
16、have dried up，” the scientists said.“The wetland plays a key role in holding water and changing the water volume of the rivers，” Wang Xugen, a researcher，said.“The reduction of the wetland on the plateau is closely connected with global warming，” Wang said, adding that even though rainfall has incre
17、ased in the area, the reduction of the wetland has reduced the flow of the Yangtze and the Yellow.Records by the weather station at the head of the Yangtze showed yearly rainfall at its source increased from 260 mm during 19912000 to 323 mm in the period 20012006. “But the increased rainfall didnt l
18、ead to more waters flowing into the rivers because the evaporation(蒸发) was so fast as a result of global warming，” Li Shijie，a researcher，said.Another study showed global warming had caused glaciers to get smaller, frozen earth to melt, grasslands to turn yellow and rivers to dry up.The QinghaiTibet
19、 Plateau used to have 36,000 glaciers covering an area of 50,000 sq km. In the past 100 years，the area has been reduced by 30 percent.1According to the passage, the true statement of the following is that_.Athe wetlands at the source of the Yellow have decreased by 29 percentBtheres no more water in
20、 about 17.5 percent of the small lakes at the source of the YangtzeCthe reduction of the wetland on the plateau has nothing to do with global warmingDyearly rainfall has increased from 260 mm to 323 mm in the past 15 years2Which of the following is NOT the result of global warming?AFrozen earth melt
21、s.BEvaporation becomes faster.CGrasslands turn yellow.DPlants grow better in greenhouses.3The area that the glaciers of the QinghaiTibet Plateau cover is now about_sq km.A35,000 B12,000C15,000 D17,0004In the passage, _plays a most important part in holding water and changing the volume of the rivers
22、.Ayearly rainfall Bthe evaporationCthe wetland Dclimate change答案与解析1B细节理解题。根据第四段 About 17.5 percent of the small lakes at the source of the Yangtze have dried up.可知，17.5%的小湖中的水都已经干涸。2D细节理解题。由倒数第二段可知A、C两项是全球变暖的结果之一；由倒数第三段可知B项也是全球变暖的结果；D项文中未提到。3A细节理解题。由最后一段可知，青藏高原原来冰川面积为50,000 sq km，而现在减少了30%。故现在的面积应该
23、为35,000 sq km，故选A项。4C推理判断题。由第五段第一句可知C项正确。.阅读填句Sure, weve all heard that we should get more sleep. The realities of life often make it become “we should get more sleep later.”_1_The result is that you wake up the next day feeling like a role of The Walking Dead. Here are four ways you can adjust your
24、 biology in order to pay less for staying up.Move around.Exercising before bed is a sure way to keep awake. Thats why you shouldnt do it when you want to go to sleep, and it is also why hitting the gym, or even some fast pushups can tell your body that its not time for bed. Being physically exhauste
25、d isnt fun when you are trying to stay up late._2_Eat more protein.Few people think about the fact that the brain and body use a lot more energy when were awake. If you are pulling an allnighter, youre going to need a lot more food than you are used to eating._3_To stay awake, plan to eat larger mea
26、ls than normal and to eat them more frequently.Drink the right stuff.Its tempting(诱人) to switch to sugary caffeine drinks like Red Bull, but the sugar will lead to a crash. Instead, if you want to use caffeine, drink early in the evening so itll wear off by the time you want to sleep._4_Dont make it
27、 worse by drinking sugar._5_Turn the lights down at night because bright lights keep you awake. For three or four hours after youre exposed to bright white light, your body wont make melatonin, a must for deep sleep.You will sleep better if you turn the lights a little bit down.A. Turn the lights of
28、f.B. Avoid bright lights.C. Just do enough to get energetic.D. And your body can never bear something like that.E. Your brain can use up to 25 percent of your total calories.F. When you stay up late, your blood sugar becomes abnormal.G. There is either more work to be done, or more fun to be had, or
29、 both.答案15GCEFB.语法填空Mary will never forget the first time she saw him. He suddenly appeared in class one day，_1_(wear) sunglasses. He walked in as if he had bought the school. And the word quickly got around_2_he was from New York City.For some reason he sat beside Mary.Mary felt _3_(please), becaus
30、e there were many empty seats in the room. But she quickly realized that it wasnt her, it was probably_4_fact that she sat in the last row.Although he thought he could escape attention by sitting at the back, he was wrong. It might_5_(make) it a little_6_(difficult) for everybody because it meant th
31、ey had to turn around, but that didnt stop the kids in the class, Of course whenever they turned to look at him, they had to look at Mary，_7_made her feel like a star.“Do you need those glasses for_8_(medicine) reasons？” the teacher asked. The new boy shook his head. “Then Id appreciate_9_if you did
32、nt wear them in class. I like to look at your eyes when Im speaking to you.” The new boy looked at the teacher for a few seconds and all the other students wondered whether the boy would do. Then he took them_10_，gave a big smile and said “That is cool.”答案与解析1wearing现在分词作伴随状语。2thatthat 引导同位语从句，无意义，也
33、不充当任何句子成分。3pleased形容词作表语。4the该处为特指。5have mademight have done 也许发生过。6more difficulta little 后跟比较级。7whichwhich 引导非限制性定语从句，在从句中作主语。8medical形容词作定语。9itit 作形式宾语。10offtake off 摘下。.短文改错Today is Toms 70th birthday, but there is anybody with him. He feels very disappointing. His sons didnt care for him on thi
34、s special day. Although the cakes are very delicious, but he doesnt want to touch it. He just wants his children come and see him. Nowadays, many young people are so busy and independent which they seldom visit their parents. But blood is thick than water. Our dear parents brought us out with a lot
35、of difficulty. Thus, we should and must bring happy to them when they become old.答案Today is Toms 70th birthday, but there is anybod with him. He feels very . His sons care for him on this special day. Although the cakes are very delicious, he doesnt want to touch . He just wants his children come and see him. Nowadays, many young people are so busy and independent they seldom visit their parents. But blood is than water. Our dear parents brought us with a lot of difficulty. Thus, we should and must bring to them when they become old.
