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【简答题】
My mother told me (turn) on the lights just now. 2. Chinese would like (make) friends with a lot of foreigners. 3. He feels like (eat) an apple 4. My father was glad (see) his old friends yesterday. 5. Look! There is a cow (lie) on the road. 6. It is time (begin) our lessons now. 7. Lots of children enjoys (listen) to music. 8. He practices (speak) English every morning. 9. We are busy (get) ready for the English exam. 10. He gave up (learn) M aths. 11. I am used to (get) up early 12. Remember (bring) your English books here. 13. You should give up (smoke). It is bad for your healthy. 14. He kept me (wait) for a long time. 15. It is not polite (talk) loudly in public.
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【单选题】We thank you for your fax dated July 7___us 500metric tons of soy beans. (词组、非谓语动词)
A.
quoting
B.
offering
C.
quoted
D.
offered
【简答题】雨滴在空中下落的过程中,空气对它的阻力随其下落速度的增大而增大。若雨滴下落过程中其质量的变化及初速度的大小均可忽略不计,以地面为重力势能的零参考面。从雨滴开始下落时计时,关于雨滴下落过程中其速度的大小v、重力势能E p 随时间变化的情况,如图所示的图像中可能正确的是A. B. C. D.
【简答题】一质量为m 的陨石从距地面高h 处由静止开始落向地面,忽略空气阻力,求:(1) 陨石下落过程中,万有引力的功是多少?(2)陨石落地时的速率是多少?设地球可看作质量 均匀的球体,其质量为M ,半径为R,万有引力常量为G 。
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