(单选题)

Underlined expression dwindled down means ______.

A.become gradually smaller

B.become gradually larger

C.stay the same as before

D.get more and more

参考答案：A

参考解析：

词义猜测题。根据文章第三句“The first day the boy had driven 37 nails into the fence”和第四句“he learned to control his anger”可知，第一天，这个男孩在栅栏上钉了37颗钉子。在接下来的几个星期里，随着他学会了控制自己的愤怒，钉子的数量逐渐减少。故选A。

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