单项选择题

These students are so busy with their lessons that they go to big department stores once in a while.

A．in no time
B．now and then
C．then and there
D．all at once
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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
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
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