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What Has SARS Brought to US In the first half of the yea......

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单项选择题
What is the real cause of the potential water crisis
A．Only half of the world’’s water can be used.
B．The world population is increasing faster and faster.
C．Half of the world’’s water resources have been seriously polluted.
D．Humanity has not placed efficient value on water resources.
单项选择题
Just over half the nurses in the 1986 study believed that management understood the effects that shift work had on them.
A．Y
B．N
C．NG
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