单项选择题

The survival of historic interests as we know it is ______ threat.

A．under
B．upon
C．within
D．towards
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单项选择题
______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.
A．Since
B．When
C．Unless
D．While
单项选择题
Ph. D. students who haven't completed their dissertations by the time their fellowships expire face a dif ficult
A．corner
B．dilemma
C．perplexity
D．bewilderment
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