单项选择题

Color-blind people often find it difficult to _________ between blue and green.

A．separate
B．distinguish
C．compare
D．contrast
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单项选择题
_________ I saw the machine, I could not have imagined how efficiently it works.
A．But for
B．Because
C．But that
D．If
单项选择题
It is difficult to _________ a conversation with all this noise around us.
A．carry on
B．account for
C．bring up
D．get through
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