单项选择题

_______ its "weights" is the Earth's gravitational attraction for the particular mass..

A．When it gives matter
B．Matter is given
C．What gives matter
D．How it is given matter.
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If reading is to accomplish anything more than _______ time, it must be active.
A．wasting
B．spending
C．passing
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Western Nebraska generally receives less snow than _______ eastern Nebraska.
A．does
B．in
C．it does in
D．in it does
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