题目

阅读下面的短文，然后以约30个词概括短文的要点。    Learning to study is not difficult. The first thing to remember is that you must be willing to learn. It doesn't mean that you must always like the subject. It does mean, however, that you must be willing to learn whatever is necessary. Try to understand why it is important and how it will help you now and later. Knowing mathematical facts will be useful in your whole life. Knowing how to spell words makes any kind of writing easier. Sometimes the subject that you think is going to be uninteresting and it will be 半径为7的圆，其圆心在坐标原点，则下列各点在圆外的是（　　）A．（3，4）B．（4，4）C．（4，5）D．（4，6）