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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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.
问答题
How is an embryotoxicity test carried out
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