单项选择题

A．They have no feathers.
B．They are used for swimming.
C．They differ on males and females.
D．They are present only on certain species.
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单项选择题
A．slavesB．maleC．femaleD．prisoners
A．slaves
B．male
C．female
D．prisoners
单项选择题
A．He feels angry.B．He wants attention.C．He’s too quiet.D．He’s very nervous.
A．He feels angry.
B．He wants attention.
C．He’s too quiet.
D．He’s very nervous.
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