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    From the earlier time it was well ___1___to the Peruvians that when a cut ___2____made in the thick skin of a ___3____tree, a white liquid like milk came ___4___. From this fluid (流动的) a sticky ___5_____of rubber might be made. This rubber is ___6____and wax-like when warm so that it is ___7_____to give any form.
    The Peruvians ___8____the discovery that it is very good for ___9____out water. Then in the early ___10____of the century they made overshoes to ___11___their feet dry. Then a certain Mr Mackintosh ___12_____coats of cloth which were ___13____with rubber. Today Mackintosh raincoats are still ___14_____after him.
    But these first rubber shoes ___15______raincoats were unpleasantly soft and sticky in ___16___. They were also stiff and very ___17____in winter. They were like wax(蜡) although they ___18____a bit stronger.
    But the rubber ___19___use today has been improved. It is ___20____sticky but soft and elastic(弹性的) and strong enough for any season.
    1. A. talked               B. heard           C. seen               D. known
    2. A. has                B. was             C. may               D. will
    3. A. rubber              B. apple           C. orange                  D. oak
    4. A. from                B. through         C. out                D. up
    5. A. raincoat            B. shoes           C. border             D. mass
    6. A. hard                     B. fast              C. stubborn            D. soft
    7. A. important            B. impossible       C. possible             D. uncertain
    8. A. made                B. found          C. wrote             D. neglected
    9. A. finding             B. keeping         C. making             D. pouring
    10. A. kind               B. part             C. sort                D. halves
    11. A. clean              B. clear           C. keep              D. prevent
    12. A. made              B. found          C. appeared           D. gave
    13. A. full                B. like             C. lined              D. applied
    14. A. looked            B. named         C. made             D. searched
    15. A. or               B. and              C. with               D. but
    16. A. today              B. summer              C. winter             D. rain
    17. A. soft                B. sticky          C. elastic             D. cold
    18. A. felt                     B. made           C. needed                  D. produced
    19. A. Mr Mackintosh      B. the Peruvians       C. we                 D. is
    20. A. also                B. always         C. neither                  D. not

    1-5 DBACD 6-10 DCABB 11-15 CACBB 16-20 BDACD

    1. D。be well known 是固定短语，表示“对…了解、熟悉”。
    2. B。因为“切口(cut)”可知应该是被人去做，所以是 was made。
    3. A。根据下文两次出现的 rubber 可得出答案。
    4. C。从上文可以得知“像牛奶一样的白色液体从橡胶树上流出来”。
    5. D。从上下文可以得知“从树上流下来的液体，慢慢会变稠”，所以“粘团”就形成了，但它不能直接形成雨衣或鞋。
    6. D。根据常识橡胶是“软的”。
    7. C。根据前面的warm 得出答案，当变暖或加热时“能”做出任何形状。
    8. A。因为“发现”是名词，不能选found，make a discovery是固定短语。
    9. B。根据常识，橡胶可以“防”水，其余选项不符句意。
    10. B。表示本世纪的“早期、前期”，不能选 halves，如果用 half不能用复数。
    11. C。根据前面的“鞋垫”和后面的“干燥”得出答案是“保持干燥”。
    12. A。根据后面的 coat 判断答案是“被做”。
    13. C。指这种布料(cloth)是用橡胶“排制”而成的。
    14. B。根据前面的雨衣判断可知仍然还是以他的名字“命名的”，其余选项不符句意。
    15. B。根据句意，这是两个物质名词 shoes 和 raincoat 是并列的，但不能选or(或者)。
    16. B。夏天天气炎热，雨衣变软，故 summer 符合语境。
    17. D。根据常识，橡胶在夏天温度高时变软，相反在冬天“冷”时变硬。
    18. A。根据前面的“像蜡”和后面的 stronger 得出答案是“摸起来”，表示感觉。
    19. C。根据句中的时间状语 today 判断是 we(我们)使用。
    20. D。根据两个相反的形容词，得出答案(not…but意为“不是…而是”)
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