公共英语五级

单选题根据下列文章回答题:

Researchers in behavioral psychology are divided with regard to__________.

参考答案:C进入在线模考
文中第一段提到“But such behavioral studies cannot distinguish between two competing theories of why sleep is good for the memory.”所以他们对为什么睡眠对记忆有好处持有不同的观点,故应选C。