单项选择题

A．One sixth of them are seriously polluted.
B．One third of them arc seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
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单项选择题
A．The Englishmen’’s habits.B．The Englishmen’’s accent.C．The Englishmen’’s character.D．The Englishmen’’s teaching styles.
A．The Englishmen’’s habits.
B．The Englishmen’’s accent.
C．The Englishmen’’s character.
D．The Englishmen’’s teaching styles.
单项选择题
Xuemei Han was the only Chinese student in the Department of Ecology and Evolutionary Biology at Yale University.
A．Y
B．N
C．NG
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