(单选题)

What does the author suggests one do when faced with a challenging problem?

A.Stop idling and think big.

B.Unlock one’s smartphone.

C.Look around oneself for stimulation.

D.Allow oneself some time to be bored.

参考答案：D

参考解析：

细节理解题。根据题干中的关键词“a challenging problem”定位第五段。第五段首句表明“无聊是有益处的”；该段第二句中的“watch paint dry or water boil”均为作者的建议，这些“无聊”的行为也许能帮助人们想出解决问题的妙招。A、B选项与答案句意思相反；C选项文章并未提到，故均可排除。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语