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．Many hours.B．One full day.C．Two full days.D．Three full days.
A．Many hours.
B．One full day.
C．Two full days.
D．Three full days.
单项选择题
What was the main concern of industrialists before the marketing concept was widely accepted
A．The needs of the market.
B．The efficiency of production.
C．The satisfaction of the user.
D．The preferences of the dealer.
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