下列说法正确的是（   ）   

山脉构成我国地形骨架，读图完成下表。

山脉	东侧（省级行政区）	西侧（省级行政区）
太行山	____	____
巫山	____	____
山脉	北侧（温度带）	南侧（温度带）
秦岭	____	____

观察图1和图2，请回答下列问题：

   

（1）请简述由图1变成图2的形成过程：____ ．

（2）若AD=3，DB=4，则△ADE和△BDF面积的和为____ ．

    Mr. Brown is a teacher. He is from New York, America. He would like（想）to work in China because he likes our country. He thinks Chinese people are very friendly and he likes to live in China. He is happy to work in our school. He likes the school life here. He teaches English. There are 50 students in his class. Mr. Brown is kind. He and his students are good friends, too.
    Now some of Mr. Brown's students play sports on the playground（操场）. Bill and Mike play tennis. Tom and John play ping-pong. The other students play basketball. Mr. Brown is happy to play basketball with them. They have a good time.
阅读上面的短文，根据短文内容，选择最佳选项。   

阅读文段，回答问题。

使至塞上   

    王维

                                                           单车欲问边，属国过居延。征蓬出汉塞，归雁入胡天。

                                                           大漠孤烟直，长河落日圆。萧关逢候骑，都户在燕然。