单项选择题

Heat exhaustion is a condition caused by ______ to sunlight or another heat source which often results in dehydration and salt depletion.

A．a reaction to
B．overexposure
C．an limitation of
D．an absence of
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单项选择题
Nepal is a country in central Asia that is landlocked and ______ by the Himalayas.
A．secluded
B．bordered
C．integrated
D．opened
单项选择题
He was busy writing the essay all the morning, only ______ occasionally to have a cup of te
A． breaking offB. breaking outC. breakingD. breaking away
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