单项选择题

_________, meteorologists hope to learn how to keep its damage to a minimum.

A．Lightning studied by
B．Lightning is studied by
C．The study of lightning
D．By studying lightning
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单项选择题
_________ you decide to spend your time, one thing is certain: you’ll arrive at your destination.
A．What
B．Whatever
C．How
D．However
单项选择题
The discovery of new oil-fields in various parts of the country filled the government with _________ hope.
A．eternal
B．infinite
C．ceaseless
D．everlasting
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