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【参考答案】

在increased后加by。
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单项选择题
Compared with those in small towns, people in large cities have______.
A．less self-discipline
B．better sense of discipline
C．more mutual respect
D．less effective government
单项选择题
The moral decline of American society is caused mainly by______.
A．its growing wealth
B．the self-centeredness of individuals
C．underestimating the impact of social changes
D．the prejudice against women and minorities
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