Questions 14-18
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Using the information in the text, complete each sentence 14-18, with a word or phrase from the list below. ·
For each sentence (14-18), mark one letter (A-G) on the Answer Sheet. ·
Do not mark any letter twice. 14. According to Dr. Score, lightning is caused by hail falling through ______.
15. The refrigerated rod served the same functions as ______.
16. Ice particles bouncing off hail falling through a cloud acquire ______.
17. In the paragraph four the word "duplicated" means ______.
18. According to S.E. Regnolds, there could be no lightning without ______.
- A. copy
- B. a positive charge
- C. a negative charge
- D. super cooled clouds
- E. falling hail clouds
- F. hail and super cooled clouds
- G. moisture particles
，则小球在从A到B的过程中克服空气阻力做了多少功？
