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问题 选择题

You can't go fishing with Dad ______ you finish your homework. [ ]

A. because

B. after

C. while

D. until

答案

答案：D

填空题
根据图片仿照例子，选词完成句子。
theirs    yours    his    hers    your    ours    their    her    our
例:

It's my kite.
It's mine.

1. It's _____________ ball.
It's _____________.
2. It's _____________ balloon.
It's _____________.
3. It's _____________ teddy bear.
It's _____________.
4. It's _____________ cat.
It's _____________.
5. It's _____________ dog.                                                                                 
It's _____________.
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判断题 案例分析题

对一批牌号为Q235的钢筋进行抽检，钢板厚度为20mm，得到各试样的屈服强度检测值分别为：227.5MPa、220.3MPa、222.0MPa、225.8MPa、229.3MPa；钢筋拉断后伸长率分别为：21%、20%、23%、27%、31%。

钢材的力学性能随厚度的增加而降低。
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