单项选择题

A．Lack of oxygen.
B．Overgrowth of water plants.
C．Low water level.
D．Serious pollution upstream.
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单项选择题
A．Sell pens.B．Repair pens.C．Develop pens.D．Making pens.
A．Sell pens.
B．Repair pens.
C．Develop pens.
D．Making pens.
单项选择题
A．A British doll.B．Her best white dress.C．Her son.D．A picture of George Washington.
A．A British doll.
B．Her best white dress.
C．Her son.
D．A picture of George Washington.
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