单项选择题

___________, it is no longer the policy of the government to maintain full employment.

A．Frequently
B．Apparently
C．Primarily
D．Previously
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单项选择题
Steven's ability to learn from observations and experience ___________ greatly to his success in public life.
A．related
B．attached
C．attributed
D．contributed
单项选择题
Color-blind people often find it difficult to ___________ between red and green.
A．identify
B．distinguish
C．separate
D．compare
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