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【解析】本题考查动量定理的应用。设该区域每立方米空间内的尘埃数为n,则在△t时间内有nv△tS个尘埃数附着于飞船表面,对尘埃由动量定理可得F△t=v△t·nmvS,代入数据解得n≈2个,D项正确。
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏词符号(/\),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:1、每处错误及其修改均仅限一词;
2、只允许修改10处,多者(从第11处起)不计分
My dentist had just pulled out one of my tooth and had told me to rest for while. My mouth were filled with cotton-wool. He knew I collected bird eggs and asks me whether my collection was growing. He then asked me a lot of other question. In answer to these questions, I could neither nod or make strange noises. Meanwhile, my tongue was busy search out the hole where the tooth had been. I suddenly felt very worried, so couldn’t say everything. When the dentist at last removed the cotton-wool, I was able to tell him of that he had pulled out the wrong tooth.
试题答案
1.tooth→teeth
2.for while中加a
3.were→was
4.asks→asked
5.question→questions
6.neither→either
7.search→searching
8.so→but
9.everything→anything
10.of去掉
【解析】
试题分析:考查名词复数,冠词,固定搭配等的掌握情况。
1. of后面应是名词的复数,所以用teeth。
2. while中加a。考查固定搭配。for a while是固定搭配,所以加a。
3. mouth是单数,所以were改为was。
4.
5. 。考查名词复数。question是可数名词,所以question改为questions。
6. or是固定搭配,所以neither改成either。
7. busy doing,所以search改为searching。
8.
9.
10.
考点: 考查名词复数,冠词,固定搭配等的掌握情况。
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