单项选择题

The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility of there being explanations alternative to the one proposed.

A．account for
B．rule out
C．guard against
D．do with
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单项选择题
The need to see that justice is done（）every decision made in the courts

A．implants into
B．imposes on
C．impinges upon
D．imprecates upon
单项选择题
The electronic computer is（）some of the tasks that were once accomplished by our own brains.

A. taking care
B. taking in
C. taking off
D. taking over
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