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
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
单项选择题
The main idea of the last paragraph is ______.
A．that the insurance company is greedy of gain
B．that insurance company makes large sums of money every week
C．the insurance company makes a great profit by investing its money in different items
D．how the insurance company makes use of its incomes and the reason why it should do
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