单项选择题

A．They are no longer produced.
B．They are used up faster than they are created.
C．The growing season of their source has become shorter.
D．Many of their sources have become extinct.
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单项选择题
A．Most are insomniacs.B．Most are teenagers.C．Most are easily cured.D．Most suffer from hypersomni
A．Most are insomniacs.
B．Most are teenagers.
C．Most are easily cured.
D．Most suffer from hypersomni
单项选择题
A．Sell his textbooks.B．Go to the bank.C．Apply for the position.D．Get some extra help.
A．Sell his textbooks.
B．Go to the bank.
C．Apply for the position.
D．Get some extra help.
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