下图为近地面某气压场中的受力平衡的风向图，图中字母a代表的是（  ）

2014年5月22日，中共中央******在上海召开外国专家座谈会。他强调，任何一个民族、任何一个国家都需要学习别的民族、别的国家的优秀文明成果。***之所以如此强调，是因为不同国家和民族的文化（  ）
①存在差异，各有千秋
②都是古老的文化，不曾中断而延续至今
③都蕴含着人类文明的成果
④具有独特性和代表性

阅读理解
    Mr. Black is American, but he is in Canada now. He is a tall man with funny glasses. He works in a big city but lives in a town far away. He lives on the twentieth floor of a building. Every morning he gets up early. Then he gets into the lift and it takes him down to the first floor. He runs to the bus stop and catches the early bus. It usually takes him about two hours to get to the factory by bus. Then he gets off the bus and walks into the workshop(车间) quickly. He starts his work at eight in the morning.

“务望全国工商各界，一律起来设法开国民大会，外争主权，内除国贼，中国存亡，就在此一举了！”（《北京学界全体宣言》）材料反映的事件是（    ）

阅读下面一首诗，完成下面小题。
                                                                                           丰乐亭游春①(其一) 

                                                                                                     欧阳修
                                                                             绿树交加山鸟啼，晴风荡漾落花飞。
                                                                             鸟歌花舞太守醉。明日酒醒春已归。
【注释】①此诗作于庆历七年，欧阳修被贬为滁州知州的第三年。丰乐亭在琅琊山幽谷泉上，距醉翁亭不远，为欧阳修所建。