单项选择题

A．Frank’’s car was accidentally lost.
B．Frank was killed in a car accident.
C．Frank fell out of a car.
D．Frank survived a car accident.
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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
单项选择题
A．On the table.B．Behind his back.C．Under his bottom.D．On his lap.
A．On the table.
B．Behind his back.
C．Under his bottom.
D．On his lap.
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