单项选择题

A．Jack is likely to help.
B．Jack doesn’’t know a lot about the problem.
C．The man has already asked Jack for help.
D．Jack was the last one who could solve the problem.
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单项选择题
Water pollution can’’t affect nature’’s balance in oceans, rakes and rivers.
A．Y
B．N
C．NG
单项选择题
What does the word provided mean as used in the passage (Line 3, Paragraph 3)
A．describe as a story
B．give what is needed
C．state as a condition
D．prove what is required
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