单项选择题

A．Guarantee full protection of the environment.
B．Centralize the management of water resources.
C．Increase the sense of responsibility of agencies at all levels.
D．Encourage local and regional control of water resources.
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单项选择题
The Greenland Inuits’’ rheumatoid arthritis levels are the lowest in the world.
A．Y
B．N
C．NG
单项选择题
The significance of Broaklehurst’’s research is that ________.
A．it suggested a way to keep some foods fresh without preservatives
B．it discovered tiny globules in both cream and butter
C．it revealed the secret of how bacteria multiply in cream and butter
D．it found that cream and butter share the same chemical composition
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