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
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单项选择题
Great as Russell was, many of his ideas ______ today and are being modified by the work of philosophers of our time.
A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
单项选择题
Outside my office window there is a fire ______ on the right.
A．escape
B．ladder
C．steps
D．stairs
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