单项选择题

A．The earth is a planet.
B．Stars in the sky are actually as small as they look.
C．Satellites are all made by men.
D．Men can conquer other planets.
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单项选择题
Compared with other major industrialized countries, the United States depends more heavily on oil import.
A．Y
B．N
C．NG
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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