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
You'd better put these documents in a safe place.（）

A．dark
B．secure
C．guarded
D．banned
单项选择题
Practically all animals communicate either through sounds or through soundless codes.（）

A．Certainly
B．Probably
C．Almost
D．Absolutely
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