根据短文理解，选择正确答案。

     New rules and behavior standards for middle school students came out. Middle schools are going to use a new way to decide who the top students are. The following are some of the new rules.

You should not dye(染)your hair, smoke or drink. You should not copy others' work in an exam. Don't do it again if you did it!

     Good students love animals and care for other people. Being kind to animals is being kind to ourselves. Be friendly to the people around you. Try to think of others, not only yourself.

Don't look down on new ideas. Everyone's ideas are important. You should welcome them, because new ideas make life better for everyone.

Learn to protect yourselves. If you have to go home late, you should let your mother or your father know.

    Use the Internet carefully. The Internet can be very useful for your studies. But some things on the Internet aren't good for teenagers, so try to look through web pages that are good for you.

如图所示的三角形数阵叫“莱布尼兹调和三角形”，它们是由整数的倒数组成的，第n行有n个数且两端的数均为$\frac{1}{n}\left(n\ge 2\right)$，每个数是它下一行左右相邻两数的和，如$\frac{1}{1}=\frac{1}{2}+\frac{1}{2}$，$\frac{1}{2}=\frac{1}{3}+\frac{1}{6}$，$\frac{1}{3}=\frac{1}{4}+\frac{1}{12}$， ，则第7行第4个数（从左往右数）为（  ）

发展农业要因地制宜，下列地区的农业发展最能体现这一原则的是（　　）

一个算法的程序框图如图所示，该程序输出的结果为（　　）