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问题 填空题

神州五号载人飞船的成功发射，标志着我国向月球发射环绕月球探测卫星的条件已渐成熟．月球距地球约为38万千米，用科学记数法表示为______千米．

答案

38万千米=3.8×105千米．

问答题 简答题

萃取第一级水相变绿的原因有哪些？
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单项选择题

Questions 14-23


·Look at the ten statements for this part.
·You will hear a story about communication through time.
·Decide whetheryou think each statement is right(R) wrong(W) or not mentioned(NM).
·You will listen to it twice.
·Markyour answers on the Answer Sheet.

In the U.S., a person who receives a dinner party invitation just the day before the party is usually pleased, because he has little time to worry about forgetting to attend.

A. Right

B. Wrong

C. Not Mentioned
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