单项选择题

The Sept. 11 attacks ______.

A．caused the U.S. economy to falter
B．worsened the U.S. economic situation
C．made housing prices soar
D．expired benefits for welfare recipients
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单项选择题
According to economist Gary Burtless, What factor accounts for the surge of homeless apart from the economic explanation
A．Political.
B．Social.
C．Religious.
D．International.
单项选择题
The word tenuous in the last paragraph means ______.
A．strong
B．enduring
C．week
D．bad
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