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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.
单项选择题
A．satisfied with the current civilian use of the element.B．the destruction of nuclear arms surpasses civilian production.C．content to export its own spent nuclear fuel.D．the current levels of production should be decreased.
A．satisfied with the current civilian use of the element.
B．the destruction of nuclear arms surpasses civilian production.
C．content to export its own spent nuclear fuel.
D．the current levels of production should be decreased.
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