四六级考试

【单选题】
A、Declining health.
B．Lack of attention.
C．Loss of motivation.
D．Improper behavior.

网考网参考答案：B
网考网解析：
According to the experiment，what problem can insufficient sleep cause in students 将选项内容与主题分析结合起来推断，该题很可能考查睡眠不足所引发的问题。题干中的insufficient sleep指的就是文中的received eight hours or less。根据students who have received eight hours or less…having the most trouble…had more difficulty paying attention可知，注意力不集中是睡眠不足导致的问题之一，因此答案是B。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>