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26. - The classroom looks like a mess!

  - Yes, but who left the waste paper      around?

  A. lie          B. to lie      C. lay          D. lying

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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

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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

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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

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22. - When do you need to pay the balance?

  -      December 31.

   A. In          B. By          C. During      D. Within

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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

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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。

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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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