单项选择题

A．The experiment will take a long time.
B．The students should count their time in the lab.
C．Dr. Walters teaches biology in the afternoon.
D．Biology lab is open one hour every afternoon.
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Trapped in this way, individual colonies cannot spread and rapidly run out of nutrients
单项选择题
A．It looks better than the other one.B．The man needs more wall space for it.C．It should be put on another wall.D．It makes the wall a little more attractive.
A．It looks better than the other one.
B．The man needs more wall space for it.
C．It should be put on another wall.
D．It makes the wall a little more attractive.
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