题目内容
18.Questions 11through 13are based on the following passage.11.A.Space ships and visitors.B.Mountains and rivers.
C.Animals and plants.D.Cities and villages.
12.A.14million.B.4million.C.400million.D.40million.
13.A.To ensure that his research work is reliable.
B.To show the possibility of intelligent life on other planets.
C.To prove the reality of intelligent life on other planets.
D.To calculate the exact number of planets which have life.
分析 略
解答 ABB
点评 略
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