题目内容
（请给出正确答案）
What is one of the problems in Biramichi River？
A．Lack of oxygen.
B．Overgrowth of water plants.
C．Low water level.
D．Serious pollution upstream.
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A、efficiency.
B、equality.
C、externality.
D、productivity.
A．executions
B．mechanics
C．elements
D．instruments
A．the weather there is bad
B．the canyon is too long
C．the flood there is dangerous
D．there are many storms
A．Some are not very good.
B．It is unusual to see such paintings.
C．Many were drawn by children.
D．The artists were mostly right-handed.
A．haze
B．wind
C．solid water
D．liquid water
A．Democritus.
B．Carl H. Snyder.
C．Amadeo Avogadro.
D．John Dalton.
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