单项选择题

America's emphasis on the importance of education for everyone has spurred scientific research.

A．encouraged
B．endangered
C．endorsed
D．enlarged
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单项选择题
Sulfur has occasionally been found in the earth in an almost pure state.
A．regularly
B．accidentally
C．sometimes
D．successfully
单项选择题
You have to follow the guide whose sole interest is to cover all spots according to his strict schedule.
A．obvious
B．simple
C．only
D．assumed
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