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问题 解答题

正方体的棱长扩大3倍，表面积扩大27倍．______．（判断对错）

答案

根据正方体的体积的计算方法和积的变化规律，正方体的棱长扩大3倍，表面积扩大3×3=9倍．

答：正方体的棱长扩大3倍，表面积就扩大9倍．

故答案为：错误．

阅读理解

阅读理解。

     Today is November 8th. It's Gina's birthday. She is twelve. Jim, Kate and Bill are her friends. They want

to buy some presents (礼物) for Gina. They go to the store next to the school. There are a lot of things in the

shop. They buy a big cake, a pencil case and some nice books. They want to buy a T-shirt for Gina, but all the T-shirts are too expensive (贵) and they don't have enough money.

1. How old is Gina today? 

A. She is 12.

B. She is 13.

C. She is 11.

D. She is 10.

2.  Gina has _____ friends.

A. four

B. three

C. two

D. only one

3. _____ is near the school.

A. Their home

B. A hospital

C. The store

D. The farm

4. They want to buy _____ for Gina.

A. A big cake

B. a big cake, a pencil case and some nice book

C. a T-shirt

D. B and C

5. At last (最后), _____.

A. they don't buy the T-shirt

B. they buy the T-shirt

C. they buy a pair of shoes

D. they don't buy any thing

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填空题

如果一个并发调度的结果与某一串行调度执行结果等价，则这个并发调度称为 ( )。

A．串行调度

B．可串行化的调度

C．并发执行的可串行化执行

D．串行控制
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