问题
单项选择题
根据爆炸的机理，爆炸过程表现为两个阶段：一是物质的潜在能以一定的方式转化为强烈的压缩能；二是( )。
A．压缩急剧膨胀，对外做功，从而引起周围介质的变形、移动和破坏
B．能量在极短的时间内、有限的体积中积聚，造成高温高压
C．参与爆炸的物质在瞬间发生分解和化合，变成新的爆炸产物
D．系统固有物理能引起爆炸
答案
参考答案：A
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根据爆炸的机理，爆炸过程表现为两个阶段：一是物质的潜在能以一定的方式转化为强烈的压缩能；二是( )。
A．压缩急剧膨胀，对外做功，从而引起周围介质的变形、移动和破坏
B．能量在极短的时间内、有限的体积中积聚，造成高温高压
C．参与爆炸的物质在瞬间发生分解和化合，变成新的爆炸产物
D．系统固有物理能引起爆炸
参考答案：A
| 完形填空。 | |||
| A boy was walking in the street __1__ a man came over __2__ him and __3__ him the way __4__the station. The boy was very naughty（顽皮的）. He wanted __5__ play a joke on the man. He pointed to __6___ side of the road and said, “Go down the street until you reach a shop. You can find it on your left.” The man thanked him and went away. A few minutes __7__the man came back. He said to boy that there was only a bookshop there and he __8__ find the station. The boy __9__ and said, __10__a map in the bookshop, and you’ll find the way!” | |||
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