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) aB) 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
KEY: BABDC BACCD ABBCC
高中VOA英语—美国习惯用语讲座(doc版) 第410 dead shot素材
高中VOA英语—美国习惯用语讲座(doc版) 第424 pink slip素材
高中VOA英语—美国习惯用语讲座(doc版) 第414 chomp at the bit素材
高中VOA英语—美国习惯用语讲座(doc版) 第412 make a killing素材
高中VOA英语—美国习惯用语讲座(doc版) 第398讲 hit the ground running素材
高中VOA英语—美国习惯用语讲座(doc版) 第436 live high off the hog素材
高中VOA英语—美国习惯用语讲座(doc版) 第387讲 paper over素材
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高中VOA英语—美国习惯用语讲座(doc版) 第435 play both ends against the middle素材
高中VOA英语—美国习惯用语讲座(doc版) 第423 lose your cool素材
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高中VOA英语—美国习惯用语讲座(doc版) 第408 stake out a claim素材
高中VOA英语—美国习惯用语讲座(doc版) 第413 feel blue素材
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高中VOA英语—美国习惯用语讲座(doc版) 第420 in the cards素材
高中VOA英语—美国习惯用语讲座(doc版) 第402讲 countdown素材
高中VOA英语—美国习惯用语讲座(doc版) 第434讲 real poop素材
高中VOA英语—美国习惯用语讲座(doc版) 第432 powder puff素材
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高中VOA英语—美国习惯用语讲座(doc版) 第428 dig up dirt素材
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高中VOA英语—美国习惯用语讲座(doc版) 第395讲 lock, stock and barrel素材
高中VOA英语—美国习惯用语讲座(doc版) 第433 poop素材