单项选择题

A．Lower body temperatures.
B．Decreased energy consumption.
C．Greater ability to conceal itself.
D．Wider range of vision.
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单项选择题
A．He is humorous. B．He is careless. C．He is thoughtful. D．He is helpful.
A．He is humorous.
B．He is careless.
C．He is thoughtful.
D．He is helpful.
单项选择题
In Britain it is very risky to ______.
A．go with a single railway ticket
B．listen to pop-music at the festival
C．sleep in the open
D．pack together in crowds
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