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
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
单项选择题
From the passage we know that if accidents will happen nine times out of ten, the insurance company will ______.
A．give a much higher price
B．charge a lower price
C．not provide its insurance service
D．quote the highest price
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