According to the author scientists______.A．have already proved that coffee is good for hu
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According to the author, scientists______.
A．have already proved that coffee is good for human health
B．have a long way to go before they find a way to study coffee
C．have avoided the cause-and-effect approach to study coffee
D．are still unable to figure out why coffee is good for us
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
根据第三段最后一句的Andevenifitturnsoutthatcoffeeisreallgoodforyou,scientistshavenoideawhy．可知科学家们对咖啡有益于人体的原因还没有弄明白，所以选项D为答案。选项C干扰性较强，从最后一段的第二句可以知道科学家们并不是一开始就haveavoidedthecause-and-effectapproachtostudycoffee，排除C。