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【参考答案】

compulsory
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单项选择题
Which of the following authors is NOT on the list
A．E. M. Forster.
B．Toni Morrison.
C．J.B. Priestley.
D．Albert Camus.
单项选择题
What has NOT been controlled at all as regards water pollution
A．Industrial polluters.
B．Sewage.
C．Rain runoff.
D．Toxic substances.
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