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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The government is doing a _______ of people's changing social habits.
A．plan
B．survey
C．project
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Do you think there's any _______ of his passing the exam
A．chance
B．opportunity
C．occasion
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