单项选择题

This explains why even our most effective efforts to move people into jobs seem never to the welfare rolls.

A．squeeze
B．shrink
C．descend
D．decrease
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单项选择题
The purpose of the psychologist's experiments is to test whether smoking has a positive effect on the mental _________ of smokers.
A．faculty
B．volume
C．capacity
D．competence
单项选择题
Human development is based not only on inborn biological states, but also on patterns of to social knowledge.
A．access
B．contact
C．acquaintance
D．path
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