肠道传染病是 A．脊髓灰质炎 B．艾滋病 C．乙型肝炎 D．猩红热 E．鼠疫

利用回声可以测量声源到障碍物的距离．科学工作者为了探测海底某处的深度，从海面向海底垂直发射超声波，经过4秒后接到回波信号．已知声音在海水中的传播速度为每秒传播1530米，请回答下列问题：

（1）人耳能听到超声波吗？为什么？

（2）海洋的深度是多少？

（3）运用声波的反射，能否测量地球和月球之间的距离？为什么．

B

On one of her trips to New York several years ago, Eudora Welty decided to take a couple of New York friends out to dinner. They settled in at a comfortable East Side cafe and within minutes, another customer was approaching their table.

“Hey, aren’t you from Mississippi?” the elegant, white-haired writer remembered being asked by the stranger. “I’m from Mississippi too.”

Without a second thought, the woman joined the Welty party. When her dinner partner showed up, she also pulled up a chair.

“They began telling me all the news of Mississippi,” Welty said. “I didn’t know what my New York friends were thinking.”

Taxis on a rainy New York night are rarer than sunshine. By the time the group got up to leave, it was pouring outside. Welty’s new friends immediately sent a waiter to find a cab. Heading back downtown toward her hotel, her big-city friends were amazed at the turn of events that had changed their Big Apple dinner into a Mississippi.

“My friends said: ‘Now we believe your stories,’” Welty added. “And I said: ‘Now you know. These are the people that make me write them.’”

Sitting on a sofa in her room, Welty, a slim figure in a simple gray dress, looked pleased with this explanation.

“I don’t make them up,” she said of the characters in her fiction these last 50 or so years. “I don’t have to.”

Beauticians, bartenders, piano players and people with purple hats, Welty’s people come from afternoons spent visiting with old friends, from walks through the streets of her native Jackson, Miss., from conversations overheard on a bus. It annoys Welty that, at 78, her left ear has now given out. Sometimes, sitting on a bus or a train, she hears only a fragment(片段) of a particularly interesting story.

What can we learn about the characters in Welty’s fiction?（）

A. They live in big cities.

B. They are mostly women.

C. They come from real life.

D. They are pleasure seekers.

党员领导干部组织实施和执行《廉政准则》的情况，应列入党风廉政建设责任制和干部考核的重要内容，考核结果应如何运用？

近日，北京石景山旁的老山发现西汉大型土坑木椁墓的消息，震动了京华大地。有专家认为它是西汉燕刺王刘旦的王陵，是有一定根据的。 刘旦的被诛，昭帝刘弗陵并未下诏明文诛戮，只含蓄地启发他自杀。他只自缢而死，并未被杀头。迫令白缢和命人执杀，在当时是有很大区别的。而且在刘旦自缢死后，天子还加恩，赦燕王太子建为庶人。特别值得注意的是，天子还特赐刘旦死后谥号曰“刺王”。凡诸侯王死后能得天子特赐谥号的，不管他是善终还是因谋反被赐死，都说明他还被朝廷保留了诸侯王的身份和地位。也就是说，他仍应以诸侯王之礼被赐建陵墓，进行葬埋。“刺”谥法说，“暴戾无亲曰剌”，被赐谥曰“刺”的王侯，多是生前德行暴戾无亲、乖谬不道并有恶行者，其意近于“厉”“戾”。但被赐谥刺、厉、戾的王侯，死后也都能建陵墓官葬。即如刘旦之长兄卫太子刘据，他因被迫自卫杀佞臣江充而被误认为谋反遭诛杀。后武帝已心知其冤，而未及给其赐谥平反。十九年后，卫太子孙刘询继位为宣帝。他既心知其祖父冤而又不敢彰其太祖父武帝之过，乃赐其祖父卫太子刘据谥号曰“戾”称，“戾太子”，并重新为戾太子改葬，起墓陵，曰“戾园”。燕王刘旦谥号曰“刺”，与“戾太子”之“戾”义相仿，也应是有陵墓的。据史书记载，他不但有陵墓，而且其陵墓的名称正是与谥号“刺”义近同的“戾”，称“戾陵”。 北魏郦道元著《水经注》第十四卷《鲍丘水注》说：“鲍丘水人潞，通得鲍丘之称矣。高梁水 (按：即高粱河)注之，首受漯水(即今永定河)于戾陵堰。水北有梁山(按，即今石景山)，山有燕剌王旦之陵，故以戾陵名堰。”说到戾陵堰，乃是北京史上以至全国历史上均有重要地位的大型古水利灌溉枢纽工程。其做法、作用和意义，均与著名的都江堰相似。不同的是，都江堰自秦蜀守李冰在公元前三世纪兴建至今两千两百余年仍在发挥巨大作用，戾陵堰却早已因永定河水土流失而废弃了。戾陵堰，乃三国时期曹魏河北大都督刘靖率军民所建。因其在梁山下燕刺王刘旦墓戾陵下筑堰，中分永定河水、凿车箱渠，以灌溉京北至通州万有余顷良田，故名其堰曰戾陵堰。据《水经注•鲍丘水注》，燕刺王刘旦的戾陵，就位于古漯水以北的梁山上。老山与古梁山密迩相连，老山乃后起之名，汉魏时期它与石景山一起均被称为梁山。老山汉墓的位置，正与郦注燕刺王刘旦戾陵相符。

文章第一段说：“有专家认为它是西汉燕刺王刘旦的王陵，是有一定根据的”，下列对这“根据”的认识，不正确的一项是（）。

A．刘旦的被诛，昭帝并未下诏明文诛戮，只含蓄地启发他自杀

B．刘旦死后，天子赦燕王太子建为庶人，并特别赐予刘旦谥号

C．燕剌王刘旦的墓，就筑在永定河北面石景山上著名的戾陵堰

D．老山汉墓的位置，正与郦道元所说的燕刺王刘旦墓戾陵相符

若某广告主付出80万元之成本，向某知名网站购买网络广告，该网站之访客率为200万人次，请问该网站广告提供的千人印象成本（CPM）为多少？（）

A.100元

B.200元

C.400元

D.800元