2020-2021学年人教版英语选修7课后作业：UNIT 3　UNDER THE SEA 单元加餐练 WORD版含解析.DOC

1、单元加餐练.完形填空Pearls (珍珠) are valuable white gems (宝物) which come from the ocean.Actually they are 1 by oysters (牡蛎，蚝) ，small shell fish that live on the 2 of the ocean. 3 oysters will make pearls; not all oysters produce them.Oysters produce pearls only when they are 4 by sand.If a 5 of sand enters the

2、 oysters 6 ，the oyster becomes hurt because the 7 grain of sand irritates (使不适，刺激) the smooth, soft skin of the oyster.The oyster tries to 8 itself by producing a white 9 that looks like milk.The oyster covers the 10 with the milky fluid.The fluid protects the oyster.Later the white liquid becomes 1

3、1 .This hardened liquid forms a shell, or bead, around the sand.At this time a pearl is beginning to 12 .The white pearl grows 13 inside the oysters shell. 14 ， it takes about six or seven years for the oyster to produce a pearl.Not all oysters produce pearls 15 most oysters sometimes take sand into

4、 their 16 .Only sand which the oyster cannot get rid of will 17 it.In other words，if an oyster “swallows” some sand, it will manage to “spit it out”If the oyster cannot get rid of the 18 ，then it will produce the white fluid to 19 itself.Actually, only about one in a thousand oysters will produce a

5、pearl；that is， 20 than one percent.本文介绍了牡蛎制造珍珠的详细过程。1A.invented BbroughtCproduced Dcaused答案：C解析：produce“生产”，根据下文“not all oysters produce them”可知C项正确。2A.bottom BbaseCsurface Dground答案：A解析：根据下文“Oysters produce pearls only when they are 4 by sand.”可知牡蛎生活在海底。3A.Only some BOnly fewCAll of DA lot of答案：A解析

6、：根据下文“not all oysters produce them”可知“不是所有的牡蛎都产珍珠，只有一些能产”。4A.harmed BcoveredCdestroyed Dinjured答案：B解析：根据上下文的逻辑关系可知，牡蛎被沙子覆盖导致沙子进入牡蛎壳内，这时牡蛎才会产珍珠。5A.piece BgrainClittle Dbit答案：B解析：a grain of sand“一粒沙子”。6A.shell BbodyCeyes Dback答案：A解析：沙子首先进入牡蛎的壳内。7A.hard BvividCsharp Drough答案：D解析：上文说牡蛎受到伤害，可见沙子是粗糙的。8A.p

7、revent BpreserveCprotect Dguard答案：C解析：protect“保护”。牡蛎是为了保护自己才产生一种白色的液体。9A.water BmatterCliquid Dobject答案：C解析：根据空格后的“that looks like milk”可知牡蛎产生的东西是一种液体。10A.injury BshellCsand Dpearl答案：C解析：因为沙子伤害了自己的身体，所以牡蛎产生的“the milky fluid”是把沙子盖住。11A.bright BhardCstrong Dpure答案：B解析：根据下文“This hardened liquid forms a

8、 shell”可知白色液体随后会变硬。12A.make BproduceCdo Dform答案：D解析：form“形成”。指此时珍珠开始形成。13A.slowly BfastCsafely Dquickly答案：A解析：根据下文“it takes about six or seven years for the oyster to produce a pearl”可知珍珠生长过程是缓慢的。14A.Often BActuallyCUsually DSometimes答案：C解析：usually“通常”。此处指珍珠通常的形成期为6到7年。15A.even though Bin caseCso lo

9、ng as Donly if答案：A解析：even though“即使”。尽管大多数的牡蛎壳内有时会进沙子，但是并非所有壳内进沙子的牡蛎都产珍珠。16A.bodies BshellsCbottoms Dcaves答案：B解析：根据第6处所在句说牡蛎壳内进沙子后导致珍珠的形成可知此处也是牡蛎的壳内进沙子。17A.destroy BirritateCsoft Dopen答案：B解析：irritate“刺激，使不适应”。此处指“只有牡蛎摆脱不掉的沙子才能刺激它”。18A.sand BshellCmilk Dliquid答案：A解析：根据上文“if an oyster swallowssome san

10、d”可知，牡蛎想摆脱掉的也是沙子。19A.cover BdestroyCproduce Dprotect答案：D解析：根据上文可知牡蛎产生的“the white fluid”是起保护作用的。20A.fewer BmoreCless Dsmaller答案：C解析：根据“one in a thousand”可知概率不到百分之一，less than one percent“不到百分之一”，less than表示“少于”。.阅读理解Whenever you buy something, it is possible that someone has already worn, eaten, or te

11、sted it to make sure it is safe and do what is supposed to do.But what if you wanted a special suit to keep a shark from hurting you? Who wants to test a product like it?“I do！”says Jeremiah Sulliwan, a scientist in California.“You have to believe in what you sell, right？”Sullivan owns SharkArmor Te

12、ch, a company that makes a $49,400 sharksuit that even a great white shark cant bite through.Before Sullivan could sell his sharksuits, he needed to make sure his design would work.Sullivan put on the sharksuit and jumped into a shark feeding ground.“I need to know exactly what a human body could ex

13、pect to go through，” he says.Sharks moved all around him and then attacked his arm.Sullivan felt the bite but no teeth.He was uncomfortable at times, but not painful.“The suit works！”“Ive now been bitten thousands of times but never badly，” says Sullivan, who now works with shows like Wild Kingdom,

14、and programs for the Discovery Channels Shark Week.So, are you all set to buy a sharksuit? Before you do, you should know that the suit weighs 20 pounds and makes swimming almost impossiblenot so practical for a day on the beach.And in fact, Sullivan wants only professionals, such as filmmakers, sci

15、entists and divers, to have sharksuits.Why? Because even if someone is wearing a sharksuit, they could get seriously hurt if they treat diving with a 4,000pound shark as a game.During sharksuit testing, sharks have thrown Sullivan to a bottom of reefs (礁) and tried to take him off into the deepest p

16、art of the ocean.“However，”Sullivan says, “you dont need to be afraid of sharks.Its actually pretty hard to get a shark to bite you.”本文主要介绍了一款防鲨服及其实际应用效果。1The first paragraph is written to .Astart a discussionBintroduce the topic of the textCshow the main points of the textDtest readers knowledge答案：

17、B解析：推理判断题。根据下文紧接着介绍了Sullivan发明的防鲨服以及相关情况，由此可见第一段是为了引出本文的话题。2Why did Sullivan get close to sharks?ATo see if his sharksuit works.BTo study what sharks feed on.CTo catch a special kind of white shark.DTo learn how to swim with sharks safely.答案：A解析：细节理解题。根据第三段第二句可知他是为了测试他的防鲨服是否有效。3What does the underli

18、ned part in Paragraph 5 mean?AMost people wont wear the sharksuit to the beach.BPeople like to go to the beach with the sharksuit.CThe sharksuit makes a perfect day on the beach.DThe sharksuit cant be worn for a whole day.答案：A解析：句意猜测题。根据画线部分的前一句.the suit weighs 20 pounds and makes swimming almost im

19、possible可知防鲨服太重以至于不可能穿上防鲨服来游泳，因此多数人不会穿着它到海滩游玩。故选A。4We can learn from the text that the sharksuit .Aworks well for swimmersBis light but uncomfortableCkeeps sharks away from humansDis designed for special purpose答案：D解析：推理判断题。根据倒数第二段第三句可知防鲨服是为特殊人群准备的，有特殊的用途。.应用文写作近年来，由于海洋污染和过度捕捞，鱼的数量和种类在急剧减少。请就此写一篇英语短

20、文，给学校英语广播站投稿。内容要点如下：1.海洋渔业资源的现状；2.分析其原因；3.提出解决问题的方法。注意： 1.词数80左右；2.可以适当增加细节，以使行文连贯。In recent years, fishing resources in the ocean have been faced with a serious situation where the quantity of fish and their species are dropping sharply.It is human behavior that is to blame.Industrial and agricultu

21、ral wastes such as chemicals and oil are poured into the ocean.Whats more，overfishing destroys the balance of life in the ocean.To handle this situation, the government should make laws and punish those who cause pollution.Besides, overfishing should be strictly banned.Also，some fishermen may take o

22、ther jobs so that there are fewer people living on fishing.Only with these measures taken can we eventually preserve fishing resources.读后续写It was Mothers Day and I was shopping at the local supermarket with my son who is five years old，Tenyson.As we were leaving after finishing our shopping，we reali

23、zed that only minutes earlier an elderly woman had fallen over at the entrance and hit her head on the ground badly.Her husband was with her，but there was blood everywhere and the woman was embarrassed and clearly in shock.Fortunately，a lot of people stopped to help out.While we were walking towards

24、 the scene，Tenyson became very worried about what had happened to the elderly couple.He said to me，“Mom，its not much fun falling over in front of everyone.”Seeing that there was a flower stall(摊位) at the front of the supermarket，he added，“Why shouldnt we buy the lady a flower？It will make her feel b

25、etter.” I was amazed that hed come up with this sweet idea who was only a fiveyearold boy.So we went over and told the flower seller what we wanted.“Just take it，” she replied，“I cant take your money for such a wonderful deed.”By now medical staff had arrived，and were looking after the injured woman

26、.There we saw the old man was also in great horror，but he tried to comfort his wife and held her hands tightly to encourage her to be strong.We gave the flower to the womans husband and I told him it was from my son.At that time，the old man started crying and said，“Thank you very much.”He then turne

27、d to me，“You have a wonderful son.Happy Mothers Day to you.”The man bent down and gave his wife the flower，telling her who it was from.Regardless of being badly hurt，the old lady looked up at Tenyson with love and appreciation in her eyes and gave him a little smile.And my son went down his body to

28、the injured lady and tenderly said，“Happy Mothers Day to you，too.”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。答案Paragraph 1：After a moment，the elderly lady was taken into an ambulance by medical staff and was sent to hospital.The crowd gradually scattered.T

29、enyson and I went home.On our way home，he asked me worriedly，“Mom，will the elderly lady be OK since she was too old and she had badly fallen over？”I looked at him and said.“The elderly lady would be fine since there were so many people coming to help her.And you did a wonderful deed，my boy.”Paragrap

30、h 2：One year later，it was Mothers Day again.As last year，I went shopping，at the local supermarket with Tenyson.Suddenly，Tenyson said excitedly，“Look，Mom.It is that old woman.”I looked that way and saw the elderly lady and her husband.It seemed that she had recovered from her injury.We walked towards them and they were happy to meet us，too.The elderly lady hugged my son and whispered to him.“I will never forget the flower you give me，my sweet boy.”