单项选择题

A．By ten months.
B．When one year old.
C．When two years old.
D．At birth.
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单项选择题
A．Mice.B．Rats.C．C ) Monkeys.D．A),B) andC).
A．Mice.
B．Rats.
C．C ) Monkeys.
D．A),B) andC).
填空题
In the author’s opinion, the option suggested by him will have a(n)______significance in solving the nuclear issues of the world.
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