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问题 选择题
已知高为2，底面边长为1的正四棱柱的俯视图是一个面积为1的正方形，则该正四棱的正视图的面积不可能等于（　　）
A．
2
-1		B．2C．
2
+1		D．2
2
答案

∵正四棱柱的俯视图是一个面积为1的正方形，

∴正方形的边长为1，正方形的对角线长为

2
，

∵棱柱的高为2，

∴当正方形的边长作为正视图的底面边长上，此时面积的最小值为S=2×1=2，

当正方形的对角线作为正视图的底面边长上，此时面积的最大值为S=2×

2
=2
2
，

∴正四棱的正视图的面积S的取值范围是[2，2

2
]．

∵

2
-1∉[2，2
2
]，

∴A不成立，

故选：A．

判断题

镶贴变形缝处的饰面板、饰面砖应按设计要求做出留缝宽度。
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单项选择题

In the New York street a small truck hit a big tree. The truck was full of glasses and they were all (41) now. The driver came out of the truck and looked at the broken glasses. He was very (42) . And people in the street were (43) for him.
Then an old man walked to the driver, looked at him for a few (44) and said, "My poor boy, I think you must (45) a lot for it."
"Yes, "was the bad answer.
"Well, "said the old man," hold out your (46) . Here’s some money for you, and I hope all the people around here will give you (47) ,too. "With these words, he walked away.
The driver held out his hat and over a hundred people came and put their money in it. At last the driver (48) a bag and put all the (49) in. Then he looked at the people and said, "Thank you very much. I’m working for that old man and all these (50) are made in his factory. \

[A] hands [B] bag[C] hat
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