题目:
完成句子。
1. A: When is______ (春节) in China?
B: It usually comes in January or February.
2. If he has nothing to do this afternoon,he will______ (一块去) us to the theatre.
3. A: ______you______ (确信)it is summer in Australia?
B:Of course.
4. A: I have a very good book.Do you want to read it?
B:______ (太好了).
5. A: When's the best time to visit Guilin?
B:______ (你愿意的任何时候)you like.
6. ______ (与……相比) to Changchun, the winter in Jinan is warm and pleasant.
7. A: There is ______ (大量的) rain in South China.
B: So it is wet there.
8. A: Why are your clothes all wet?
B: Bad luck!I am just caught in ______ (一场大雷阵雨).
9. A: What's the weather like there?
B: It's fine______ (整年).
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:利用极限的思维方式,若滑轮的质量m=0,则细绳对A和B的拉力大小和相等为T.假设,A和B一起运动的加速度为a,根据牛顿第二定律分别对A、B有:,联立解得:,对于C选项当m=0时,。故选C点评:难题。对于一...