单项选择题

Shopping malls customarily experience some slack periods for sales, especially so in summer.

A．successive
B．lasting
C．prosperous
D．dull
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单项选择题
Along with aging, the function of tissues and organs gradually degenerate, causing disease.
A．disrupt
B．deter
C．deteriorate
D．descend
单项选择题
The military move was to integrate the West German divisions into the Atlantic defense system.
A．complete
B．exclude
C．entail
D．incorporate
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