单项选择题
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A.She is not sure Tom is joking.
B.She thinks Tom wants to go into business.
C.She thinks Tom may sell his shop.
D.She thinks Tom has already studied in university.
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单项选择题
We may infer that iodine, fluoride and calcium are______.
A.substances which act positively or negatively on man’’s health
B.harmful substances in the water supply
C.substances which help provide breeding places for pests
D.substances contributory to good health
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