Andy is 12 years old. He is one of my best f____. He is a top student in Class 6. But he doesn't have a good diet.

    Every morning, he doesn't eat breakfast. It isn't right. I think breakfast is very i____ for him. It helps him start the day w____. He has lots of snacks like chocolates, sweets every day. They make him fat. It's bad for his health. Andy shouldn't eat too many snacks any more. In vegetables and fruits there are many vitamins. But he h____ eating them. These days he doesn't feel good.

    I think he needs to c____ his diet. And he needs to exercise more. I'm sure he'll be better.

   2016年第三十一届夏季奥林匹克运动会将在巴西里约热内卢举行，来自世界各地的数万名运动员将为亿万观众奉献最高水平的“体育盛宴”，据此，读图回答下题．

$\frac{1}{4}$开平方的结果是（　  　）