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单项选择题
In the process of cloning, what ultimately activates the cell to start dividing
A．An adult cell inserted into an egg.
B．An electronic stimulation.
C．An artificially fertilised egg.
D．Another donor cell.
单项选择题
From the example of two people walking along, one an economist and the other a non-economist, we can see that______.
A．the economist may apply the view of profit opportunities excessively
B．the economist has quicker insights than the non-economist
C．the economist has a better understanding of profit opportunities than the non- economist does
D．profit opportunities appear even in our daily life
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