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A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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单项选择题
A．Whether to accept the Dean’s job offer or not.B．Whether to move or not.C．whether to have a rest or not.D．whether to ask for an extension or not.
A．Whether to accept the Dean’s job offer or not.
B．Whether to move or not.
C．whether to have a rest or not.
D．whether to ask for an extension or not.
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