单项选择题

A．It marked the beginning of a new era in animal science.
B．Dolly, a clone, was able to breed normally and produce healthy lambs.
C．Cloned animals can be used to treat human diseases.
D．A cloned animal can lead a normal life.
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单项选择题
A．To be excused.B．To be a free man in the prison.C．To be helped out of the prison.D．To explain the mistakes he had made.
A．To be excused.
B．To be a free man in the prison.
C．To be helped out of the prison.
D．To explain the mistakes he had made.
单项选择题
A．The U. S.B．Other countries.C．Post-Cold War politics.D．All of the above.
A．The U. S.
B．Other countries.
C．Post-Cold War politics.
D．All of the above.
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