单项选择题
21（）
A．Likewise
B．Besides
C．Thus
D．Otherwise
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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
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