单项选择题

How many types of motors are generally used in the shaver

A．Two.
B．Three.
C．Four.
D．Not known.
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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 passage, which is the principal energy source of home heat
A．Wood.
B．Coal.
C．Natural gas.
D．Petrol.
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