单项选择题

Mary rarely speaks to Susan.

A．slowly
B．seldom
C．weakly
D．constantly
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单项选择题
Practically all animals communicate either through sounds or through soundless codes.
A．Certainly
B．Probably
C．Almost
D．Absolutely
单项选择题
The policemen acted quickly because lives were at stake.
A．in danger
B．in difficulty
C．in despair
D．out of control
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