单项选择题

A．send messages to satellites.
B．learn something new about space.
C．go aboard a spacecraft.
D．operate Mission Control.
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单项选择题
A．are greater than its supply.B．are less than its supply.C．will not overtake North America within five years.D．will not overtake any other country in the world.
A．are greater than its supply.
B．are less than its supply.
C．will not overtake North America within five years.
D．will not overtake any other country in the world.
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