填空题

【参考答案】

“does”改为“do”
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单项选择题
Scientists are trying to find a link between pollution and ______.
A．intelligence levels
B．antisocial behavior
C．birth defects
D．divorce percentage
单项选择题
Which sentence proves that setting the giant reflector is a delicate operation
A．The first sentence in the last paragraph.
B．The second sentence in the last paragraph.
C．The last sentence in the last paragraph.
D．The last sentence in the third paragraph.
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