在国际上，被誉为“中国的绿色长城”、“世界生态工程之最”的是 （  ）

如今，无论是在公交车上、饭桌上，还是在楼梯间、马路上，低头看手机屏幕的人随处可见，他们走路看、吃饭看、坐车看、等人看，有的甚至开车时也看。对于这部分人来说，“低头”似乎已经成为他们标志性的特征，他们被成为“低头族”。你对这些“低头族”的建议有（）
①认识手机的危害，拒绝使用手机 ②努力学习，培养高雅的生活情趣，转移注意力  ③请老师、父母和同学帮助监督，提高自控能力 ④自觉抵制手机中的不良诱惑 

①将拉动消费需求，催生增长热点

②可促进消费升级，带动产业转型

③能改善消费环境，满足生活需求

④能引导理性消费，改善人民生活

在沿水平方向的匀强磁场中，有一圆形金属圈可绕沿其直径的竖直轴自由转动，开始时线圈静止，线圈平面与磁场方向既不平行也不垂直，所成的锐角为$\alpha$。在磁场开始增强后的一个极短时间内，线圈平面（  ）

根据对短文的理解，选择正确答案。

    For children,healthy eating is one of the most important things. Here are some ideas about how to keep fit.

    Having breakfast

    A good breakfast is very important for children. But some children often go to school without breakfast, just because they want to sleep a little longer. Remember a good breakfast will help you study better.

    Having milk

 “My dream is that all the Chinese children can get half a kilo of milk a day.” The Chinese Premier(总理)Wen Jiabao said this during(在……期间)his visit to a milk farm.Milk is also very important to children's health. It makes children grow stronger. It's better for you to have a glass of warm milk before going to bed.That will help you have a good sleep.

    Having healthy food

Having healthy food is the most important. That is eating lots of different kinds of food,especially(尤其)fruit and vegetables.Don't eat too many sweet snacks. Some of you like eating fast food, but it is not good for your health.