单项选择题

According to the text, every year lightning

A．does considerable damage to buildings during thunderstorms.
B．kills or injures mainly golfers in the United States.
C．kills or injures around 500 people throughout the world.
D．damages more than 100 American power companies.

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单项选择题

The main topic discussed in the text is

A．the damage caused to US golf courses and golf players by lightning strikes.
B．the effect of lightning on power supplies in the US and in Japan.
C．a variety of methods used in trying to control lightning strikes.
D．a laser technique used in trying to control lightning strikes.