英语六级

单选题

A.Sleep apnea will necessarily lead to depression.
B.Half of the people suffering sleep apnea will become depressed.
C.The relationship between sleep apnea and depression still needs further proof.
D.There is no connection between sleep apnea and depression.

参考答案:C进入在线模考
According to the study, what is the relationship between sleep apnea and depression?  C。

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