The Development of Rubber
Here is the story of rubber. From the earliest time it was __1__ common knowledge to the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid __2__ milk came out, and that __3__ this a sticky mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any __4__. The Peruvians made the discovery that it was very good for keeping out __5__. Then in the early 1800s, the Americans made use of it for the first time. First they made overshoes __6__ their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh __7__, and our raincoats are still named after him.
But these first rubber overshoes and raincoats were all soft and sticky in summer, and __8__ and inelastic in the winter when it was cold. But the rubber we have today is soft and elastic, though very strong---even in the __9__ summer and the coldest winter. This was made __10__ by a man called Goodyear. __11__ experiments, he found that nitric acid made the rubber much better, but it is not hard and strong enough. Then strange thing took place. A friend of __12__, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulphur and put in the sun. Goodyear put this idea __13__ the test, and saw that it did have more or less the desired effect---though somewhat less than more. The only effect it had was on the outside of the rubber. It is common knowledge now that the way to make rubber hard and strong is __14__ sulphur. It took Goodyear four more years to find this method. When at last he did it, he had nothing at all. Everything of the smallest value __15__ to get money, even his sons school-books.
1. A) a
B)
C) an
D) the
2. A) like
B) alike
C) in the form of
D) similar
3. A) with
B) from
C) up
D) of
4. A) thing
B) heat
C) press
D) form
5. A) wet weather
B) wet day
C) the wet
D) wet
6. A) to make
B) to keep
C) make
D) keep
7. A) did
B) had done
C) has done
D) was doing
8. A) cold
B) cool
C) hard
D) strong
9. A) warmer
B) warm
C) warmest
D) warm-up
10. A) impossible
B) possibly
C) possibility
D) possible
11. A) After many
B) With an
C) Having made much
D) With regard to
12. A) him
B) his
C) them
D) theirs
13. A) on
B) to
C) in
D) with
14. A) to heat with
B) to heat it by
C) by heating it with
D) by heating with
15. A) was used
B) had used
C) had been used
D) was being used
我的弟弟
Overcame Carsickness 克服晕车
考试后……
Traveling on National Day 国庆节出游
逛公园
Par excellence? 出类拔萃
最喜欢的水果
展望2009
买玩具
小鸟哭了
一碗饭
元宵节赏烟花
我的一家
我的一个朋友
草莓
绿与丹的意义
快乐的元宵节
我种水仙花
The Products With Excessive Packaging 过度包装的产品
Who Should Be Responsible For Leftover Women 谁该为剩女负责
开心
春天
逛商店
读阿凡提有感
玫瑰、郁金香和小草
秋天
待到满山红叶时,我在香山笑
读《小布头新奇遇记》有感
香喷喷的土豆菜
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