Using the information in the text, complete each sentence 14-18, with a word or phrase from the list below. For each sentenc

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问题     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.
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
According to S.E. Regnolds, there could be no lightning without ______.

选项

答案F

解析 由文章最后一句话:“Without hail and super cooled clouds,he concluded,there couldbe no lighting.”(没有冰雹和极度冷却的云层就不会有闪电。)得出F为正确选项。
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