单项选择题

47()

A.before 
B.while 
C.since 
D.when

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单项选择题
What is probably the best title for this passage()

A. A Risky Trip Up Mount Everest
B. Pollution on Mount Everest
C. Mount Everest—Clean-up Effort
D. Robert Hoffman and His Clean-up Team
单项选择题
46()

A.history 
B.date 
C.beginning 
D.development
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