单项选择题

His writing is so ________that we can' t clarify his ideas in first reading.

A．obscure
B．objective
C．obliging
D．obstacle
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单项选择题
The past decade has been the warmest for 1,000 years, according to a(n) ________of ice cores drilled from a glacier(冰川) in the Himalayas.
A．analogy
B．analysis
C．anniversary
D．appendix
单项选择题
Although sports ________the household, Joe drew the line when they interfered with family traditions and routine.
A．overwhelmed
B．breached
C．dominated
D．impaired
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