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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A tariff is a customarily collected tax on goods _______ in to a country.
A．come
B．coming
C．came
D．have coming
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They bought the land with a _______ to building a new office block.
A．purpose
B．reason
C．view
D．goal
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