___ helped to found a company called Revolymer to commercialize the technology.

　　Today’s chewing gums are made from synthetic(人工制造的) latex(植物的乳汁), which is resistant _22____ the weather and is strongly sticky. The new gum adds a special polymer to modify(修改，改变) its properties(特性), _23

　　_____ (make) it far __24

　　___ sticky.

　　In two street trials, other commercial gums remained stuck to the pavement ___25

　　___ Clean Gum came away(脱掉，脱落) naturally in all cases.

　　【参考答案】（11）

　　16. be removed

　　17. If

　　18. a

　　19. it

　　20. environmentally

　　21. who

　　22. to

　　23. making

　　24. less

　　25. while

　　【阅读理解】----文化教育类

　　B“I can't tell you how pleased I am to be here. I haven't seen many of you since your graduation, but I have followed your careers and enjoyed your victories as well as crying for your tragedies. I have a large collection of newspaper photographs of my students. Although I haven't appeared in person, I have attended your college graduations, weddings and even the births of your children, in my imagination.”

　　Ms. Yates paused and started crying a bit. Then she continued：

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