专四

单选题When does excessive sleep usually first become apparent?

A． During early childhoo 
B．In a person's teen
C． In a person's twentie 
D． After a person turns fift

参考答案：B进入在线模考
细节题。文中提到“Though not apparent in childhood，this symptom most often appears for the first time during the teen years and continues through a person’s life”由此可知，嗜睡的征兆不是在儿童期显现，而是在青少年时期，因而[B]正确。

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