单项选择题

A．Because they pollute air.
B．Because they are natural hazards.
C．Because they are increasing in numbers.
D．Because people don’’t walk so often.
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单项选择题
The passage mainly discusses ______.
A．Enron’’s misuse of partnerships
B．the failure of Enron in America
C．two cases of Enron’’ s top officials
D．Enron’’ s hidden financial situation
单项选择题
A．Six months.B．Ten months.C．One year.D．One year and a half.
A．Six months.
B．Ten months.
C．One year.
D．One year and a half.
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