D. Decrease.

　　48. According to what Richard Butler said, what caused dinosaurs to die out?

　　A. A shortage of clean water.

　　B.A break in the food chain.

　　C. A small variety of animals.

　　D. The constant warming climate.

　　49. What was the negative effect of the asteroid hitting Earth?

　　A. Oceans became too hot for animals.

　　B. There was less oxygen in the oceans.

　　C. Earth's climate became violent.

　　D. The majority of the plants gradually died out.

　　50. The text is mainly about

　　.

　　A.

　　the evolvement of mammals on Earth

　　B.

　　the gradual process of climate change

　　C.

　　the importance of the balance of ecosystem

　　D.

　　the cause of the extinction of the dinosaurs

　　笫二节根据对话内容，从对话后的选项中选出能填人空白处的最佳选项。选项中有两项多余选项。（共5小题；每小题2分，共10分）

　　M: Overseas Travel Agency. May I help you?

　　W: Yes, my husband and I are planning a vacation to an island.

　　51

　　M: Certainly. Off the top of my head, I would suggest the island of Bali.

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