单项选择题

Insurance premiums do not become too high because ______.

A．not many people suffer loss
B．they are fixed according to how likely the risk of loss is to happen
C．not many people insure themselves
D．insurance companies compete with each other

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单项选择题

According to the writer, insurance is ______.

A．useful but too risky
B．useful and necessary
C．costly but worth buying
D．cheap but not necessary

单项选择题

I didn' t understand at first why he couldn' t pass the test, no matter ______ hard he had tried.

A．when
B．where
C．what
D．how