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举一反三
【单选题】Rarely do major diseases have a single cause. They are usually the result of a complex interaction between many factors, including genetic, environmental and lifestyle components. Many media reports, ...
A.
people in Wales eat more unhealthy food than people in the US
B.
people in Wales are poorer than people in the US
C.
people in Wales are richer than people in the US
D.
cancers in Wales are caused by more complex factors than those in the US