单项选择题

A．Just five minutes.
B．Slightly less than an hour.
C．Between one and two hours.
D．A little more than two hours.
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单项选择题
A．Clean.B．Noisy.C．Dirty.D．Quiet.
A．Clean.
B．Noisy.
C．Dirty.
D．Quiet.
单项选择题
A．They eat protein.B．They never move from one location.C．They cause erosion of rocks.D．They are found only in deep water’.
A．They eat protein.
B．They never move from one location.
C．They cause erosion of rocks.
D．They are found only in deep water’.
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