27. Times are changing and the world is not as safe as it once was, ______ is one reason many children have a cell phone with them.

　　 A. what　　　　　　 B. who　　　　　　 C. that　　　　　　 D. which

26. The volunteers who help the homeless children believe that every person has something to give in return for what ______.

　　 A. has received　　　 B. has been received　 C. will receive　　　 D. will be received

25. Laboratory safety training is mainly to make the people ______ in a laboratory aware of the possible dangers that may threaten them.

A. working　　　　　 B. work　　　　　　 C. to work　　　　 D. worked

24. There might be different views on music but one fact cannot be ignored ______ it has a great effect on our emotions.

A. that　　　　　　 B. which　　　　　 C. what　　　　　　 D. why

23. I looked ______ lots of different books but couldn’t find anything ______ what John had told me.

　 A. through; of　　　　 B. up; in　　　　　 C. for; about　　　　 D. in; about

22. Research shows pet owners visit the doctor less often and experience less sleeping difficulties than ______ without a four-legged friend.

　 A. ones　　　　　　 B. those　　　　　 C. who　　　 　　　D. that

第一节 单项填空(共15小题；每小题1分，满分15分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

21. - If you have any question, please feel free to call us.

- Thank you, Mr. Anderson. I certainly ______.

　 A. should 　　　　　B. can　　　　　　 C. will　　　　　　 D. shall