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．Michael and Tom have ordered all the food.B．Michael and Tom have made ail the preparations.C．Other friends will bring all the stuff they need.D．Michael’s mother has prepared all the food.
A．Michael and Tom have ordered all the food.
B．Michael and Tom have made ail the preparations.
C．Other friends will bring all the stuff they need.
D．Michael’s mother has prepared all the food.
单项选择题
A．He is disappointed.B．He is pleased.C．He is indifferent.D．He is angry.
A．He is disappointed.
B．He is pleased.
C．He is indifferent.
D．He is angry.
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