单项选择题

In his biography, the old scientist is described as a very ______ truth seeker.

A. infectious
B. prosperous
C. industrious
D. generous
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单项选择题
He would try to ingratiate himself ______ his clients in order to earn more money.
A. into
B. with
C. for
D. from
单项选择题
Over the past ten years, natural gas production has remained steady, but ______ has risen steadily.
A. consumption
B. dissipation
C. disposal
D. expenditure
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