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.
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填空题
Emotional roller coaster refers to____________________.
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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