30. My bicycle is nowhere to be found. Who ___ have been using it?

A. should　　 　　　 B. must 　　　　　　　　 C. could　 　　　　　 D. might

29. He cut off the electricity immediately he found the dangerous situation, thus ____ a fire accident.

A. prevented 　　　 B. to prevent 　 C. would prevent 　 　　 D. preventing

28. But at other moments you will find him gentle and weak, _____ he cries about the lost lives of people drowned in ships that have sunk.

A. as with 　　　　 B. as for 　　　 C. as to 　　　　　　　 D. as when

27. They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.

A. which; that 　　 B. it; one 　　　　 C. that; one 　　　　　 D. one; that

26. They find themselves surrounded by colorful rocks, fishes, seashells and plants, all ____ slowly in the blue water.

A. waving and moving　 B. waved and moved

C. waved and moving 　　 D. waving and moved

25. Even though the pure water is ____ gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.

A. the one 　　　　 B. which 　　　　　 　　C. what 　　　　　　　　 D. that

24. Mike is Mrs.’ pet student, ____ all her students no one else is as nice as he.

A. because 　　　　 B. because of 　　　　　 C. with　 　　　　　　　 D. as　

23. He came running along and climbed ____ the train just as it was about to leave.

A. aboard 　　　　　 B. board 　　　　　　　 C. abroad　 　　　　 D. on abroad　

22. Just as one of the parents ____ it, students today are under far greater stress than ever.

A. says 　　　　　　 B. speaks 　　　　　 C. puts 　　　　　　　　 D. gets

第一节 语法和词汇知识(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. All the classmates are trying to make the party ____.

A. success 　　 B. a success 　　　 C. succeeded 　　　 D. successfully