如图所示，倾角为37^o的粗糙斜面固定在水平地面上，斜面上放置质量均为1kg的A、B两物体，A、B之间有一劲度系数很大的轻质弹簧，弹簧与A栓连，与B接触但不栓连，初始弹簧被锁定，弹性势能为4J，A、B恰好静止在斜面上，物体与斜面间的最大静摩擦力与滑动摩擦力相等，B与斜面间的动摩擦因数是A的2倍，现解除弹簧锁定，A、B在极短的时间内被弹簧弹开，求：

我国的地形种类齐全，各种地形的面积相差很大，其中所占面积最大的是（    ）

根据短文内容，判断正确还是错误。

    I'm a junior high school student. My name is Sarah. I have a pretty aunt. Her name is Jenny. She is an actress. She must be at least thirty-five years old. In spite of this, she often appears on the stage as a young girl. Jenny will have to take part in a new play soon. This time, she will be a girl of seventeen. In the play, she must appear in a bright red dress and long black stockings. Last year in another play, she had to wear short socks and a bright, orange-coloured dress. If anyone ever asks her how old she is, she always answers,“Darling, it must be terrible to be grown up!”This is my lovely aunt. I love my aunt.

张明读书不用功，经常不按时完成作业，考试成绩也十分不理想，老师批评他，他却总是抱怨老师对他不够宽容。 

“黄梅时节家家雨 青草池塘处处蛙”形象地描述了那种天气（　　）