填空题

A. occurs most infrequently
B. is shifted sideways by strong winds
C. is often hidden from our view
D. is equipped with a good knowledge of various forms of lightning
E. is estimated at 20 millions a year
F. is positively charged

In most cases of cloud-to-ground lightning, the ground’s surface ______.

【参考答案】

F

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A. occurs most infrequentlyB. is shifted sideways by strong windsC. is often hidden from our viewD. is equipped with a good knowledge of various forms of lightningE. is estimated at 20 millions a yearF. is positively charged In most cases of cloud-to-ground lightning, the ground’s surface ______.