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问题 单项选择题

甲、乙两人参加某电视台举办的答题闯关游戏，按照规则，甲先从6道备选题中一次性抽取3道题独立作答，然后由乙回答剩余3题，每人答对其中2题就停止答题，即闯关成功。已知在6道备选题中，甲能答对其中的4道题，乙答对每道题的概率都是。则甲、乙至少有一人闯关成功的概率是()。

A.A

B.B

C.C

D.D

答案

参考答案：D

解析：

甲不能成功闯关的概率为此时乙闯关不能成功的概率为

填空题

根据句意和中文意思或所给词，写出正确的单词。

1. You are ______ (suppose) to shake hands when you meet a Chinese friend.

2. Keep your eyes ______(close) when you are doing eye exercises.

3. A knife is used for _______(cut) things.

4. Trees can keep water from _______ (run) away.

5. Everything was ______( familiar ) with me because I was in Japan for the first time?

6. Do you still remember______(看见) me somewhere in Beijing ?

7. Give up bad _________ (举止) and be polite.

8. ________ ( 花 ) time with family and friends is very important.

9. He is _________ (满意)with his son.

10. People are pretty _______( 宽松 ) about time in Colombia.
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单项选择题

WJ-8型扣件标准轨距时使用（）轨距挡板。

A.11号

B.8号

C.7号

D.9号
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