单项选择题

According to the passage, which is the principal energy source of home heat

A．Wood.
B．Coal.
C．Natural gas.
D．Petrol.
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Which of the following countries has the largest share of coal reserves in developing countries
A．Saudi Arabia.
B．Japan.
C．China.
D．Chil
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According to the Velen model, the middling sort of customers bought luxury goods to______.
A．gratify themselves
B．show individualism
C．keep up with the Joneses
D．boast of their wealth
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