填空题
As human rela tionships () so important。
【参考答案】
are
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单项选择题
Typical () and symptoms are often seen here.
A.signs
B.mark
C.sign
D.marking
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单项选择题
The researchers hypothesized that some of the () may help reduce a person’s risk of colon concer.
A.combination
B.consumption
C.compounds
D.cmposition
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