单项选择题


A．and
B．but
C．unless
D．since
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单项选择题
A．OccasionallyB．UnfortunatelyC．ActuallyD．Naturally
A．Occasionally
B．Unfortunately
C．Actually
D．Naturally
单项选择题
It can be inferred that proper amounts of iodine, fluoride and calcium can ______.
A．benefit people's physical health
B．influence the quality of water supply
C．help provide breeding places for pests
D．strengthen a person's character
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