单项选择题

Little rain and higher temperature have () the shortage of water in these poor areas.

A. eased
B. worsened
C. excluded
D. improved

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Thanks to effective security measures, heart operations are () as dangerous as before.

A. even more
B. to date
C. no longer
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Athletes from all over the world will () for championships in Beijing.

A. complete
B. compete
C. compensate
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