单项选择题

Questions 14-17 are based on the following dialogue. What is the main purpose of the man’s trip

A．To improve his skating techniques.
B．To climb mountains.
C．To take a vacation.
D．To learn to ski.
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单项选择题
What will be used to power cars in the next few decades
A．Gas.
B．Electricity.
C．Solar energy.
D．Alcohol.
单项选择题
D
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