26. - The classroom looks like a mess!
- Yes, but who left the waste paper around?
A. lie B. to lie C. lay D. lying
25. - I think we’ll give Bob a ring.
- We . We have been out of touch with him for ages.
A. will B. may C. have to D. ought to
24. Honey, stay outside and __________a few minutes; then we’ll go to church together.
A. hang around B. hang up C. hang on D. hang out
23. - Why didn’t you go camping with us?
- But I all about it!
A. forget B. was forgetting C. have forgotten D. had forgotten
22. - When do you need to pay the balance?
- December 31.
A. In B. By C. During D. Within
第一节 单项填空(每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21. I think information of this kind is help when you look for a job.
A. 不填;a B. the; a C. an; a D. the; 不填
20.A [解析]mg=和T=2π可得:T=2πR,故(1)错误;由表中数据可大致判断(2)正确;随振动时间的延长,带电体漏电,两带电体间的引力减小,相当于公式中的g减小,周期的增大,故(3)错误(4)正确,故正确的选项为A。本题以单摆和库仑扭秤为原型,主要考查考生实验探究能力和误差分析,本题较易。
19.A [解析]卫星在星体表面运行,由万有引力提供向心力G=,得第一宇宙速度:v=,则地球第一宇宙速度:v1=,月球的第一宇宙速度v2=。代入数据解得v2≈1.68 km/s,故正确的选项为A,本题主要考查第一宇宙速度,本题较易。
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