单项选择题

Questions 13 to 15 are based on the conversation you have just heard.

A. To improve his skating techniques.B. To take a vacation.
C. To take a course. D. To learn to ski.
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单项选择题
B
单项选择题
A. The high temperatures required for its use.B. The high cost of materials used in its production.C. The lack of trained environmental engineers.D. The opposition of automobile manufacturers.
A. The high temperatures required for its use.
B. The high cost of materials used in its production.
C. The lack of trained environmental engineers.
D. The opposition of automobile manufacturers.
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