单项选择题

A．By cloning endangered species.
B．By preventing them from being killed.
C．By watching over them carefully.
D．By conducting many experiments.
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单项选择题
A．The cup is already full.B．She is full.C．She would be impolite to accept another.D．She thinks she would be foolish not to refuse since it’s delicious.
A．The cup is already full.
B．She is full.
C．She would be impolite to accept another.
D．She thinks she would be foolish not to refuse since it’s delicious.
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