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
Over the past ten years, natural gas production has remained steady, but ______ has risen steadily.
A．consumption
B．dissipation
C．disposal
D．expenditure
单项选择题
John D. Rockefeller,______, owned 90 percent of all American oil refineries.
A．as still a young man
B．while still a young man
C．a young man however
D．in spite of a young man
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