30. I threw myself ____ the Spanish classes and after three months I could carry on a simple conversation.

A. to　 B. on　 C. into　 D. away

29. Miles can be ____ to kilometers by using a simple mathematic formula.

A. converted　 B. connected　 C. exchanged　 D. transported

28. Because of the environment is getting worse and worse, a large ______ of desert _____ has covered the farmland.

A. number; has　 B. quantity; has　 C. number; have　 D. quantity; have

27. A trainer attached two baskets _____ two poles and began the interesting game.

A. with　 B. to　 C. in　 D. on

26. - What about the price of petrol now?

- It has been ______ 20 percent since the beginning of this year.

A. increased to　　 B. risen by　　 C. increased by　　 D. risen to　

25. After numerous experiments, some doctors have made a _____ in the treatment of cancer.

A. breakdown　　　　　 B. breakup 　

C. breakthrough　　　　 D. breakout

24. We experimented ____ putting oil and water together, and we saw that they didn’t mix.

A. with　 B. at　　 C. for　　 D. by　　　　　

23. - I heard he was caught in a tsunami.　

- Yes, but he was lucky to escape ___.

A. injured　 B. to be injured　 C. being injured　 D. injuring

22. Since no one likes long speeches, I decide to make a(n) ___ one that is easily accepted by the audience.

A. simple　　　 B. small　　 C. brief　　　 D. easy

第一节 单项填空(共15小题； 每小题1分，满分15分)

21. Many experts home and abroad were _____ to carry out this important experiment.

A. brought in　 B. brought on　　 C. brought out　 D. brought up