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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According to the passage, which is the principal energy source of home heat
A．Wood.
B．Coal.
C．Natural gas.
D．Petrol.
单项选择题
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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