单选题According to the author, scientists ______.Ahave already proved that coffee is good for human healthBhave a long way to go before they find a way to study coffeeChave avoided the cause-and-effect approach to study coffeeDare still unable to figure out why coffee is good for us
单选题
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
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解析：
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