[判断题]
阅读短文，判断正误。
Are you frightened when you hear thunder? Children are frightened by thunder because they don’t know what it is. Thunder is caused by lightning. When a lightning travels from the cloud to the ground, it opens up a little hole in the air, called a channel. Once the light is gone, the air crashes back together and creates a sound wave that we hear as thunder. The reason we see lightning before we hear thunder is because light travels faster than sound.
3. The sound of thunder is created by the air crashing back.
选项（2分）：
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二蛋说：在有限的条件下，二蛋将尽最大努力提供一个纯净无广告，无安装插件，无病毒，并且直观超级简洁的海量学习题目平台，感谢各位用户的支持！[判断题] 波长为λ的单色光垂直入射在缝宽a=2λ的单缝上。单缝处的波面可划分为4个半波带,对应于衍射角30°正确 、正确。 错误 、错误。 |
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[单选题]You _____business interfering with my affairs. A have none 。B have no 。C have none of the 。D have nothing like 。 |
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[单选题]The thieves _____the waste paper all over the room while they were searching for the diamond ring. A spread 。B scratched 。C scattered 。D burned 。 |
[单选题]Advertising media like direct mail, radio, television and newspapers _____to increase the sales of industrial products. A have been used 。B will be used 。C is being used 。D has been used 。 |
[单选题]It turned out that the children were not _____for the accident. A to blame 。B to be blamed 。C to be blaming 。D to have been blaming 。 |
[单选题]Of course, talking about something which affects them personally is _____motivating for students. A chiefly 。B correctly 。C currently 。D eminently 。 |
[单选题]I don’t know you want to keep the letter, I’ve _____it up. A torn 。B given 。C broken 。D disposed 。 |
[单选题]A large part of a person’s memory is _____words and combination of words. A by means of 。B in terms of 。C in connection with 。D by way of 。 |
[单选题]Once our chickens started laying eggs, we had such a _____of eggs that we were giving many away to our neighbors. A output 。B surplus 。C production 。D plenty 。 |
[单选题]_____, she led a life of complete seclusion. A Being disgraced 。B Disgraced 。C Disgracing 。D She was disgraced 。 |
[单选题]She put an extra blanket over the baby for fear that _____. A he catches cold 。B he should catch cold 。C he caught cold 。D he be catching cold 。 |
[单选题]My cousin Nancy is often in a poisonous mood; I suppose it’s because she is _____child. A one 。B a lone 。C a single 。D an only 。 |
[单选题]The _____problem of bringing a spaceship back from the moon has been solved. A technical 。B technological 。C technique 。D technology 。 |
[单选题]When Ann broke the dish she tried to put the _____back together. A fragments 。B pieces 。C bits 。D slices 。 |
[单选题]On no account _____ever leave the baby at home alone. A should you 。B you should 。C shall you 。D you shall 。 |
[单选题]I was awfully tired when I got home from work, but a half hour nap _____me. A revived 。B released 。C relieved 。D recovered 。 |
[单选题]The desegregation was achieved through a number of struggles, _____been mentioned in previous chapters. A a few of which 。B a few of them 。C a few of those 。D a few of that 。 |
[单选题]To make this _____clear we shall have to look closely into biology’s long history. A distinction 。B indication 。C recognition 。D constitution 。 |
[单选题]Information and opinion gap exercises have to have some content _____talking about. A worthwhile 。B worthily 。C worth 。D worthy 。 |
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[单选题]_____the stress of examinations are over, we call all relax. A while 。B Even though 。C Now that 。D For 。 |
[单选题]_____ drills that have no real topic have to remain as they are. A Manufacture 。B Manipulative 。C Manipulate 。D Manifest 。 |
[单选题]The audience waited in _____silence while their aged speaker searched among his note for the figures he could not remember. A respective 。B respect 。C respectful 。D respectable 。 |
[单选题]They have considered their high standard of living a(n) _____for practicing their basic beliefs. A award 。B reward 。C result 。D consequences 。 |
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[单选题]One day we all may find it useful to have a(n) _____for sending documents, writing any pictures across the telephone lines. A receiver 。B echo 。C extension 。D facility 。 |
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[单选题]Einstein won the Nobel Prize in 1921 and enjoyed great fame in Germany until the rise of Nazism _____he was expelled from Germany because he was a Jew. A when 。B who 。C then 。D for him to 。 |
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[单选题] 玻尔兹曼分布（）A 是最概然分布，但不是平衡分布。 B 是平衡分布，但不是最概然分布。 C 即是最概然分布，又是平衡分布。 D 不是最概然分布，也不是平衡分布。 |
[单选题] 按照经典的能均分定理，由刚性双原子分子组成的理想气体的定体摩尔热容量是理想气体常数R的（ ）A 1倍。 B 1.5倍。 C 2倍。 D 2.5倍。 |
[单选题] 计入大气压强所得的压强为（）A 绝对压强。 B 相对压强。 C 静压强。 D 压力。 |
[单选题] 同一种气体的定压摩尔热容大于定容摩尔热容，其原因是（）A 气体压强不同。 B 气体温度变化不同。 C 气体膨胀需要做功。 D 气体质量不同。 |