单项选择题

The cause for the heat in the interior of the earth is ______.

A．radioactive element
B．the great pressure of the earth
C．not determined
D．volcanic action in the interior of the earth
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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
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.
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