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.
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单项选择题
Why is it likely for those cloned animals born alive to have abnormalities
A．Scientists haven't got the faintest idea at all.
B．Scientists haven't researched into the cause.
C．Scientists speculate that there must be something wrong in the genetic reprogramming.
D．Scientists calculate that those animals are susceptible to diseases.
单项选择题
What description best fits Mrs. Calloway, as the author perceived her
A．A warm-hearted person.
B．An awesome person.
C．A substitute mother.
D．A tutor.
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