如图，三视图描述的实物形状是（　　）

    China is a big country. The weather in the south(南方)is different from that in the north(北方). Beijing is a beautiful city of China. In this city, spring is warm; summer is hot; autumn is cool and winter is cold. But in the south of China, it is always warm. In Hong Kong and Sanya, people like to swim in the sea. They can't see snow. In the north of China, people can make snowmen and play with snowballs in winter. People like to spend their holiday(度假) in the south in winter, and in the north in summer.

把函数y=sin(2x+$\frac{\mathrm{\pi }}{4}$)的图象向左平移$\frac{\mathrm{\pi }}{8}$个单位，再将横坐标缩小为原来的$\frac{1}{2}$，则其解析式为____ 

你认为以下哪一项对课文中语句的理解是正确的（）

“普及高中阶段教育，逐步分类推进中等职业教育免除学杂费”，十八届五中全会的这一决定（    ）

①有利于维护教育公平发展              ②有利于促进社会和谐稳定

③能完全激发人的潜能和发展          ④能更好地保障学生的受教育权