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  3. Human beings are animals．We breathe，eat and digest，and reproduce the same life【1】common to all animals．In a biological laborato

Human beings are animals．We breathe，eat and digest，and reproduce the same life【1】common to all animals．In a biological laborato

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问题   Human beings are animals．We breathe，eat and digest，and reproduce the same life【1】common to all  animals．In a biological laboratory，rats，monkeys，and humans seem very much the same．
  However，biological understanding is not enough：【2】itself，it can never tell us what human beings are．【3】to our physical equipment—the naked human body—we are not【4】animal．We are tropical creatures，【5】hairless and sensitive to cold．We are not fast and have neither claws nor sharp teeth to defend ourselves．We need a lot of food but have almost no physical equipment to help us get it．In the purely physical【6】，our species seems a poor【7】for survival．
  But we have survived—survived and multiplied and【8】the earth．Some day we will have a 【9】 living  on the moon，a place with neither air nor water and with temperatures that turn gases into solids．How can  we have done all these things．Part of the answer is physical．【10】its limitations，our physical equipment  has some Important【11】，We have excellent vision and hands that can 【12】 objects with a precision  unmatched by any other 【13】 ，Most importantly，we have a large brain with an almost 【14】 number of  neural【15】，
  We have used this physical equipment to create culture，the key to our survival and success．If we livein the Arctic，we supply the warmth our tropical bodies need 【16】clothing，shelter，and 【17】heat．If a million people want to live in a desert that supplies natural food for only a few hundred，we find water to grow food and【18】deficits by transporting supplies from distant places．Inhabitants of our evenmal moon colony will bring their own food and oxygen and then create an artificial earth environment to supply necessities．With culture，we can overcome our natural limitations．
  It was not always【19】Our distant ancestors were just animals，faced with the limits of their phvsical equipment．They had no【20】and lacked the physical capacity to use it．
【2】
选项 A、On
B、With
C、For
D、By
答案D
解析 考查固定搭配。By itself为固定用法，意思是“独自地，单独地”。故选By。
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