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

Although not fully understanding processes of lightning man______

【参考答案】

D

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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 lightning E is estimated at 20 millions a year F is positively charged Although not fully understanding processes of lightning man______