问题
填空题
Questions 14-18
·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
答案
参考答案：B
解析： 由文章第1段第3句：“Ice particles bouncing off the falling hail acquire a positive charge and rise to the top of the cloud while the hail carries a negative charge to the bottom of the cloud．”可知答案应为B，即从冰雹上面掉落的冰块带有正电。
