单项选择题

Although specific concerns may determine the intent of a research project, its results are often ______.

A．unanticipated
B．beneficial
C．expensive
D．spectacular
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单项选择题
Compared mathematically to smoking and driving, almost everything else seems relatively risk-free, ______ almost nothing seems worth regulation.
A．yet
B．since
C．so
D．even though
单项选择题
Some works of literature hold one's interest to the very last page, but others serve only as a ______, to be kept handily at a bedside table.
A．reference
B．soporific
C．pleasure
D．reminder
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