单项选择题

The subject of this passage is the ______.

A．formulation of volcanoes
B．results of volcanic actions
C．work of geologists
D．interior of the earth
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单项选择题
According to the first paragraph, which of the following statements is true
A．A passenger by air will have to pay more attention to the insurance company than a mountain climber.
B．A passenger by air will take greater risk of being killed than a man crossing a busy road.
C．A passenger by air will take less risk of being killed than a man crossing a busy street.
D．A motorist should pay the highest price to the insurance company.
单项选择题
According to the passage, if an airline has an accident-free record, it usually pay ______.
A．no premium
B．less premium
C．a large premium
D．the same premium as the other companies
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