A. water-based life.

　　B. oxygen-based life.

　　C. methane-based life.

　　D. liquid -based microorganisms.

　　【答案】：C

　　44.It can be inferred from Mark Allens address that

　　A. Scientists are trying to conform there islife on Titan.

　　B. Scientists agree that a chemical reaction is a convincing explanation.

　　C. Scientists share the opinion that a biological explanation is reasonable.

　　D. Scientists are arguing over whether there is life on Titan.

　　【答案】：A

　　45.Which of the following can replace the title of this passage?

　　A.A different Life Form, a Possibility.

　　B. Earthlike Living Beings Found on Titan.

　　C. Finding of One More Moon of Saturn.

　　D. Titan, a New Satellite Found.

　　【答案】：A

　　第五部分：补全短文(第46~50题，每题2分，共10分)

　　下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章面貌。

　　Voice Your Opinion : Change Is Needed In Youth Sports

　　Everywhere you look，you see kids bouncing a basketball or waving a tennis racquet(网球拍)。And these kids are getting younger and younger. In some countries，children can compete on basketball，baseball，and volleyball teams starting at age nine.(46)And swimming and gymnastics classes begin at age four，to prepare children for competition. Its true that a few of these kids will develop into highly skilled athletes and may even become members of the national Olympic teams.(47)This emphasis on competition in sports is having serious negative effects.

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