单项选择题

A．It helps improve their safety.
B．It allows them to swim faster.
C．It helps them fight their predators.
D．It allows them to avoid twists and turns.
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单项选择题
A．She has been studying late into night all week.B．She has made plans to work late all week.C．She has not been free to go out with Abruzzi all week.D．She has been busy tidying up her apartment all week.
A．She has been studying late into night all week.
B．She has made plans to work late all week.
C．She has not been free to go out with Abruzzi all week.
D．She has been busy tidying up her apartment all week.
单项选择题
A．He fed the dog happily.B．He picked up the dog by the tips of its ears.C．He sat in a chair with the dog dangling beside him.D．He made people laugh by kissing the dog’’s ears.
A．He fed the dog happily.
B．He picked up the dog by the tips of its ears.
C．He sat in a chair with the dog dangling beside him.
D．He made people laugh by kissing the dog’’s ears.
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