为帮助广大考有效备考2012年职称英语考试，中国职称英语考试网站编辑特为您整理了职称英语理工类完型填空模拟练习题，希望对您的考试有所帮助！
The Development of Rubber
Here is the story of rubber. From the earliest time it was common knowledge （1） 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（粘的） 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 （5） that it was very good for keeping out. Then in the early 1800's, the Americans made use of it for the first time. First they made overshoes to （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（无弹性的） in the winter when it was cold. But the rubber we have today is soft and elastic（有弹性的）, （9） very strong－even in the summer and the coldest winter. This was made （10） by a man called Goodyear. After many （11）, he found that nitric acid （硝酸） made the rubber much better, but it is not hard and strong enough. Then strange thing took （12）. A friend of his, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulphur（硫磺） 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 （14） to make rubber hard and strong is by heating is with sulphur. It took Goodyear four more years to find this method. When at last he did it, he had （15） at all. Everything of the smallest value had been used to get money, even his sons' school-books.
1 A for B to C about D with
2 A like B alike C resembled D similar
3 A on B from C up D in
4 A use B heat C pressure D form
5 A creation B invention C discovery D recognition
6 A retain B keep C hold D set
7 A did B built C tried D conducted
8 A weak B gentle C hard D strong
9 A or B however C though D even
10 A capable B probable C practical D possible
11 A experiments B checks C discoverles D works
12 A form B place C shape D size
13 A on B to C in D with
14 A system B style C way D direction
15 A everything B anything C nothing D something
参考答案：
1. B 2. A 3. B 4. D 5. C
6. B 7. A 8. C 9. C 10. D
11. A 12. B 13. B 14. C 15. D
特别提醒：为了方便广大考生（或学员）及时查询成绩，中大网校还为您提供了考试成绩查询信息免费短信提醒服务，我们会将考试成绩查询相关信息第一时间发送到您的手机上。点击订阅免费短信提醒服务!
考前培训：为帮助广大学员有效备战2012年职称英语考试，中国职称英语考试网站现特别打造了考前辅导八折优惠套餐，本班次可以帮助广大学员全程强化教材基础知识，系统掌握考试答题方法与技巧，并在短时间内抓住考试考点，现在报名原价500元/科，现价400元/科，八折优惠！机会难得，还等什么，快来参加2012年职称英语考试前辅导吧，点击报名>>>
编辑推荐：
