单项选择题

A．the economic boom in many countries.
B．the refusal of many countries to export oil.
C．the embargo against Iraqi oil exports.
D．competition among exporting countries.
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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.
A．send messages to satellites.
B．learn something new about space.
C．go aboard a spacecraft.
D．operate Mission Control.
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