单项选择题

During the Ice Ages, man developed the use of tools, and thus a way of protecting himself against ______.

A．shortcomings
B．faults
C．mistakes
D．hazards
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单项选择题
Dried vegetables are easy to use if you remember to ______ them overnight.
A．plunge
B．bathe
C．soak
D．immerse
单项选择题
Some language students reach a high ______ of competence in communication.
A．level
B．note
C．grade
D．mark
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