请你用所学知识解决以下问题：

    Jiaozi is the Chinese name of dumplings. We have all kinds of dumplings with meat or vegetables in it. Jiaozi is very delicious and it is very popular (受人喜爱的) in China, especially (尤其) during Spring Festival. People usually eat jiaozi on the eve of Spring Festival. Why do people like eating jiaozi? Because Spring Festival is Chinese New Year. People eat round jiaozi to show their wishes for good luck. The history of jiaozi is about 2, 000 years. Eating jiaozi is a very happy thing. When all the families make jiaozi together, you'll feel very happy.

小梦在探究“滑动摩擦力的大小与哪些因素有关”时，作了如下猜想：

A．可能与接触面的粗糙程度有关；

B．可能与压力的大小有关。

接着她按如图所示的步骤进行实验：

读如图“黄土高原部分地区景观图”完成下列要求．

有关水循环的正确叙述是（）