24. _____ to nuclear radiation, even for a short time, may do great harm to your body.

A. Exposed　　　　　

B. Being exposed　　　　　　

C. Having exposed　　　

D. After being exposed

23. This requires you to be patient ______ you have to read the information to decide _______ it is related to ______ you are researching.

　　 A. because; if; that　　　　　　　　　　　　　　　 　B. with what; whether; what　　

　　 C. as; if; what　　　　　　　　　　　　　　　　　　 D. for; whether; that

22. The number of road accidents and the deaths _______ those accidents______ greatly over the past year.

A. arose from; increased　　　　　　　　　　　　

B. resulting from; has increased

C. arising from; increased　　　　　　　　　　　　　

D. resulted from; has increased

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. President Hu Jintao left Beijing on Monday, April 12, 2010, on_____ 10-day, four-nation trip to attend______ Nuclear Security Summit in Washington.

　A. a; the　　　　　　　　 B. the; the　　　　　　 C. a; a　　　　　 D. the; a