单项选择题

A．One sixth of them are seriously polluted.
B．One third of them are seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
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问答题
Suppose you are studying at a university which offers scholarships to those students whose average mark is over 90. Your record for the last final examination is 95, so you write a letter to apply for the scholarship. You should write at least 120 words and you should base your composition on the outline.
单项选择题
A．In a laboratory.B．In a drugstore.C．In a supermarket.D．In the dining hall.
A．In a laboratory.
B．In a drugstore.
C．In a supermarket.
D．In the dining hall.
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