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 Dr. Score , lightning is caused by hail falling through ______.

选项

答案D

解析 相关信息参看文章第1段第2句:“Dr.Scorer believes the cause is hail failing through supercooled clouds.”(Dr.Scorer认为闪电是冰雹划过温度极低的云层而产生的。)
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