26. Some developed countries are most ________ for causing climate change.

A. responsible　　 　　　　　　 B. available　　　　　 　　 C. suitable　　　　　 　　 D. acceptable

25. Today young people under 25 make up nearly half of the American population, many of ________ will soon be in charge of the nation.

A. them　　　　　 　　　　　　 B. who　　　　　　　 C. whom　　　　　　 　　 D. that

24. The new shirt you bought for me ________ very comfortably.

A. is worn　　 　　　 　　　　　　　 B. is wearing　 　　 　　　 C. has worn 　　　 　　　　　　　 D. wears

23. -I think the waiter has forgotten us. We ________ here for an hour!

　　 -I think you’re right. He probably thinks we have already ordered.

A. are waiting　　　　　　　　　　 B. have been waiting　 　 C. have waited　　　　 　 　 D. will wait

22. Michelle Obama, ________ as the First Lady of the United States, presents to the world a new image of African-American woman.

A. having known　　　 　　 B. known　　　　　 　 C. to be known　　 　 D. knowing

3] 孙红梅.中学化学研究性学习的探究与实践.硕士学位论文.2004.11.

2] 郑金洲.生成教学[M].福建：福建教育出版社.2005.