兼跨A和B所在地势阶梯，有长江、黄河两大河流流经，且五种基本地形类型齐全的省级行政区是（  ）

给出下列命题：

（1）小于$\frac{\mathrm{\pi }}{2}$的角是锐角 

（2）第二象限角是钝角

（3）终边相同的角相等 

（4）若α与β有相同的终边，则必有α﹣β=2kπ（k∈Z），正确的个数是（　　）

试回答下列有关问题：

伟大的祖国幅员辽阔，每个区域都闪耀着不同的光芒，经济发展方式各具特色，扬长避短、因地制宜，走可持续发展之路是永恒的主题，下列地区的农业生产，符合可持续发展要求的是（　　）

    It's September 13th today. It's my birthday. I get up early at 5:30 in the morning. After breakfast, I go to the park with my parents. We take many photos. In the afternoon, my father buys a big birthday cake for me. My friends make many beautiful cards for me. We eat the birthday cake together. I am very happy.