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
There are three bodies of writing that ______ on this question and we will consider each in turn.
A．bear
B．live
C．count
D．rely
单项选择题
Children who are described as mildly mentally handicapped are often upset to hear themselves described as such, and such terms as children with learning difficulties are now ______.
A．at large
B．by use
C．in vogue
D．for change
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