单项选择题

A．affect
B．weaken
C．impair
D．reduce
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单项选择题
A．additionB．practiceC．dictationD．demonstration
A．addition
B．practice
C．dictation
D．demonstration
单项选择题
It is said that Washington’s teeth were made of
A．sheep’s teeth.
B．cow’s teeth.
C．stone.
D．wood.
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