单项选择题

A．They have difficulty identifying these ceils.
B．They aren’t sure how these cells work.
C．They’ve learned how to reproduce these cells.
D．They’ve found similar cells in other species.
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单项选择题
A．He was very slow in doing things.B．He was the right person to do such a thing.C．He is expected to do such a thing.D．He would never do such a thing.
A．He was very slow in doing things.
B．He was the right person to do such a thing.
C．He is expected to do such a thing.
D．He would never do such a thing.
单项选择题
A．Mark doesn’t like water.B．Mark doesn’t belong here.C．Mark is like a fish.D．Mark is in this class.
A．Mark doesn’t like water.
B．Mark doesn’t belong here.
C．Mark is like a fish.
D．Mark is in this class.
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