单项选择题

A. Bad weather.
B. Human error.
C. Breakdown of the engines.
D. Failure of the communications system.
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单项选择题
A. In a school B. On the phone. C. At an education fair. D. In a street.
A. In a school
B. On the phone.
C. At an education fair.
D. In a street.
单项选择题
A. Writing. B. Intensive reading. C. Conversational. D. Listening.
A. Writing.
B. Intensive reading.
C. Conversational.
D. Listening.
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