甲乙两台机器功率之比是2：3，甲工作1min，乙工作40s，甲乙两台_爱下问搜题

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问题选择题

甲乙两台机器功率之比是2：3，甲工作1min，乙工作40s，甲乙两台机器做功之比为　 [ ]

A． 1：1

B． 2：3

C． 9：4

D． 4：9

答案

答案：A

简答题

如何培养坚强的意志？

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补全对话，情景问答

为下列问句选择合适的答语。

( ) 1. What are you doing?
( ) 2. Did Tom sleep on the train?
( ) 3. Did you go fishing yesterday?
( ) 4. Where did you put the book?

A. No, he sang songs on the train.
B. I put it on the bed.
C. Yes, I did.
D. I am drawing a picture.