单项选择题

A．The speed of light.
B．The speed of telecommunications.
C．Astronauts landing on the moon.
D．The United States.
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单项选择题
A．Astronomy.B．Psychology.C．Job counselling.D．Physical therapy.
A．Astronomy.
B．Psychology.
C．Job counselling.
D．Physical therapy.
填空题
Environmentalists hold the view that growing GM crops affect ______.
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