单项选择题

A．They have difficulty identifying these cells.
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．Ask one’’s mom and dad to help.B．Change the lifestyle of the whole family.C．Work together friendly.D．Launch a competition for losing weight.
A．Ask one’’s mom and dad to help.
B．Change the lifestyle of the whole family.
C．Work together friendly.
D．Launch a competition for losing weight.
填空题
transportation
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