单项选择题

A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
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单项选择题
A．Insomnia.B．Anemic.C．High blood pressure.D．Appetite.
A．Insomnia.
B．Anemic.
C．High blood pressure.
D．Appetite.
单项选择题
A．No fuel.B．Ice on the wing.C．Engine trouble.D．No food.
A．No fuel.
B．Ice on the wing.
C．Engine trouble.
D．No food.
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