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问题 选择题

美丽的大自然蕴藏着丰富的矿产资源。钻石是经过琢磨的金刚石，下列说法正确的是[ ]

A、金刚石比石墨的硬度高

B、金刚石是一种金属单质

C、金刚石是可再生资源

D、在金刚石被琢磨成钻石的过程中，金刚石发生了化学变化

答案

答案：A

完形填空

根据语篇情景，用恰当的短语或句子填空，使之意思完整。（每空2分，共6分）

There was a little boy and he had a bad temper(脾气). His father wanted to change him. Then he gave his son a box of nail(钉子). He told his son to put a nail in the wall every time he lost his temper. The first day the boy put 37 nails into the wall. It is hard for him to do that. And the second day he put 20 nails into the wall. Gradually the boy found that it was easy to keep calm, but (____小题1:________________) put the nail into the wall. At last, the box was empty and the boy’s temper (___小题2:______________). Then the father told the son to pull out the nails and said, “Look at the holes, although the nails were gone, the wall will never be the same as before. Try to keep kalm. Don’t hurt others easily. Sometimes it’s not enough to say sorry when you (__小题3:_______________).”
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单项选择题

以下传感器分类中（）是按传感器的能量转换情况来划分的

A.速度传感器

B.电气式

C.物性型

D.能量控制型
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