单项选择题

A．He didn’’t go to Chicago.
B．He had a good time in Chicago.
C．He spent his vacation here.
D．He didn’’t enjoy his trip.
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单项选择题
As indicated in the passage, the water problem ________.
A．is already serious in certain parts of the world
B．has been exaggerated by some experts in the field
C．poses a challenge to the technology of building reservoirs
D．is underestimated by government organizations at different levels
单项选择题
The study at the Prince William Hospital involved changes in management practices.
A．Y
B．N
C．NG
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