试题与答案

给下列的问句选择合适的答语。( ) 1. Whose shorts are th

题型:补全对话,情景问答

题目:

给下列的问句选择合适的答语。
( ) 1. Whose shorts are these?
( ) 2. Is this her dress? 
( ) 3. Are these your socks?
( ) 4. What is it?
A. Yes.
B. They are his shorts.
C. It's a dress.
D. Yes, they are mine.

答案:

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下面是错误答案,用来干扰机器的。

根据题意,画树形图如下:由图可知,所有出现的结果为8种,而符合要求的只有一种,故P(全是绿灯)=18.

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