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现代信息技术革命推动人类进入知识经济时代,使人类的生产、生活发生着深刻变化。下列能体现这一变化的是（   ）

A．乘火车旅行

B．打越洋电话

C．用电灯照明

D．网上购物

“我爱我的宁夏美，塞上明珠放光辉；高峡出平湖，大坝多奇伟；千里河套歌甜花香，广阔平原牛壮羊肥……”，2008年9月23日，宁夏回族自治区成立50周年，分析下列图表资料回答：

资料一：图Ⅰ是宁夏附近区域一月平均气温等值线和年降雪等日数线图；

资料二：图Ⅱ，宁夏沙坡头经过50年不懈的治沙努力，成果卓著，1994年被联合国授予“全球环保500佳单位”的光荣称号。

（1）读资料一，Q处有一重要的南北走向山脉           ，在古代称之为“朔方之保障，沙漠之咽喉”，原因是什么？

（2）Q处年降雪日数的范围是            ，不同于周边地区的主要原因是什么？

（3）读资料二，回答：

①图中铁路和被沙障直接阻隔的沙漠分别是             （填正确项字母）。

A．包兰铁路、腾格里沙漠                B．京包铁路、腾格里沙漠

C．包兰铁路、毛乌素沙漠              D．兰新铁路、毛乌素沙漠

②沙坡头地区治沙工作卓有成效，下列说法正确的是         （填正确项字母）。

A．利用麦草、稻草等材料扎设方格状的挡风墙可以削减风速，截留水分

B．方格状沙障能大量吸收地下水，促使植物生长，固定沙丘

C．方格状沙障固沙成本低，费工小，应大规模推广

D．利用麦草、稻草等材料扎设方格状的挡风墙，属于生物固沙

上市公司的股票价格（）

A.反映了资本和获利之间的关系

B.反映了每股盈余大小及时间价值

C.反映了每股盈余的风险

D.代表了公司的价值

Almost everyone likes dogs, and almost everyone likes to read stories about dogs.
I have a friend. He has a big police dog named Jack. Police dogs are very clever. Every Sunday afternoon my friend takes the dog for a long walk in the park. Jack likes these long walks very much.
One Sunday afternoon, a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack out for a walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention. He went on talking. At last Jack got angry. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he took the visitor’s cap in his mouth.

Jack sat down in front of the visitor because he wanted ______.

A. to see the visitor
B. to show the visitor how clever he is
C. the visitor to leave

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