单项选择题

A．The test pilot may lose his life.
B．The plane falls down like a stone.
C．The test is made at extremely high altitudes,
D．The engines are not in working order.
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单项选择题
A．When the plane is in danger.B．During test flights in the air.C．When all the engines suddenly go wrong.D．During test flights in the lab.
A．When the plane is in danger.
B．During test flights in the air.
C．When all the engines suddenly go wrong.
D．During test flights in the lab.
单项选择题
A．Warm-hearted but careless.B．Curious and mischievous.C．Helpful and tricky.D．Prudent but cautious.
A．Warm-hearted but careless.
B．Curious and mischievous.
C．Helpful and tricky.
D．Prudent but cautious.
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