2. 外语
  3. A. Cloud-to-ground lightening occurring in the US B. Types of lightening C. Cause of lightening D. Differences between thunder a

A. Cloud-to-ground lightening occurring in the US B. Types of lightening C. Cause of lightening D. Differences between thunder a

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问题 A. Cloud-to-ground lightening occurring in the US
B. Types of lightening
C. Cause of lightening
D. Differences between thunder and thunderstorm
E. Frequencies of thunderstorms occurring in the world and the US   
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 lightening
E. is estimated at 20 millions a year   
F. is positively charged
选项
答案F
解析 该题可根据句意，直接借助常识判断答案。答案相关语句在第2段。答案相关句：In most instances of cloud-to-ground lightning，the negatively charged lower portion of the cloud repels negatively charged particles on the ground’s surfaces，making it become positively charged．The positive charge on the ground gathers at elevated Points．
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