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为了传输MIDI消息，MIDI设备之间的通信采用异步串行方式，每次传输所采用的格式为：1个起始位，后跟 【19】 个数据位，最后是1个停止位。
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阅读下列这则笔记，然后回答问题。答谢中书书陶弘景山川之美，古来共谈。高峰入云，清流见底。两岸石壁，五色交辉。青林翠竹，四时俱备。晓雾将歇，猿鸟乱鸣；夕日欲颓，沈鳞竞跃。实是欲界之仙都。自康乐以来，未复有能与其奇者。 作者以此文寄答友人，表达了一种什么样的心境？
MP3文件采用的数据压缩编码标准是 【16】 Layer3。
第二篇Online Cancer Chat with a Safety NetCancer Research ,UK has launched an online chat forum for cancer patients to swap(交换)stories and share experiences on how to cope with such a devastating disease.But Cancer Chat is a forum with a difference: it has an information safety net.This means that a Cancer Research UK team will keep a watching brief to ensure that patients are not subjected to rogue (劣等的) "cancer cures" or scientifically unsound information.Anyone can have access to the messages posted on Cancer Chat, but if people wish to post a message, they will need to register.And Rebekah Gibbs, cancer patient and star of TV’s Casualty, has pledged her support for the new project. "I think Cancer Chat is a brilliant idea," she said. "I have written a public diary about what I went through with breast cancer and I have had such a heart-warming response from other people going through the same thing.""The idea of a Cancer Chat forum means you can share information about treatment and side effects and you can really open up about your feelings online in a way that can be difficult when talking to close friends and family. And with Cancer Research UK monitoring the forum, people can be reassured about the quality of information being exchanged."Cancer Chat will also encourage its users to check out any cancer questions on its CancerHelp UK website, which is specially designed to give patients and their families 6,000 pages of up-to-date information that is easy to understand and explains a wide range of treatments for different types of cancer and gives details of clinical trials. There is also a UK database of cancer clinical trials.The award-winning website attracts around one million visitors a month and Cancer Research UK hopes that some of these visitors will also want to post comments on the Cancer Chat forum.For those who do not have access to computers and have questions about cancer, the charity’s team of cancer information nurses are available during office hours to talk over patients’ concerns on the phone. Cancer Chat is different from other forums chiefly in that（）
阅读下面这篇现代文并回答问题。 城市和旷野 毕淑敏 城市是一粒粒精致的银扣，缀在旷野的黑绿色大氅上，不分昼夜地熠熠闪光。 我所说的旷野，泛指崇山峻岭，河流海洋，湖泊森林，戈壁荒漠……一切人烟罕至保存原始风貌的地方。 旷野和城市，从根本上讲，是对立的。 人们多以为和城市相对应的那个词，是乡村。比如常说“城乡差别”“城里人乡下人”，其实乡村不过是城市发育的低级阶段。再简陋的乡村，也是城市的一脉兄长。 惟有旷野与城市永无声息地对峙着。城市侵袭了旷野昔日的领地，驱散了旷野原有的驻民，破坏了旷野古老的风景，越来越多地以井然有序的繁华，取代我行我素的自然风光。 城市是人类所有伟大发明的需求地，展览厅，比赛场，评判台。如果有一双慧眼从宇宙观看夜晚的地球，他一定被城市不灭的光芒所震撼。旷野是舒缓的，城市是激烈的。旷野是宁静的，城市喧嚣不已。旷野对万物具有强大的包容性，城市几乎是人的一统天下…… 人们为了从一个城市，越来越快地到达另一个城市，发明了各种各样的交通工具。人们用最先进的通讯手段联结一座座城市，使整个地球成为无所不包的网络。可以说，人们离开广义上的城市已无法生存。 我读过一则登山报道，一位成功地攀上了珠穆朗玛峰的勇敢者，在返回营地的途中，遭遇暴风雪，被困，且无法营救。人们只能通过卫星，接通了他与家人的无线电话。冰暴中，他与遥距万里的城市内的妻子，讨论即将出生的孩子的姓名，飓风为诀别的谈话伴奏。几小时后，电话再次接通主峰，回答城市呼唤的是旷野永恒的沉默。 我以为这凄壮的一幕，具有几分城市和旷野的象征，城市是人们用智慧和心血，勇气和时间，一代又一代堆积起来的庞然大物，在城市里，到处文明的痕迹，以至于后来的人们，几乎以为自己被甲执兵，无坚不摧。但在城市以外的广袤大地，旷野无声地统治着苍穹，傲视人寰。 人们把城市像巨钉一样，楔入旷野，并以此为据点，顽强地繁衍着后代，创造出溢光流彩的文明。旷野在最初，漠然置之，甚至是温文尔雅的接受着。但旷野一旦反扑，人就一筹莫展了。尼雅古城，庞贝古城……一系列历史上辉煌的城郭名字，湮灭在大地的皱褶里。 人们建造了越来越多越来越大的城市，以满足种种需要，旷野日益退缩着。但人们不应忽略旷野，漠视旷野，而要寻觅出与其相亲相守的最佳间隙。善待旷野就是善待人类自身。要知道，人类永远不可能以城市战胜旷野，旷野是大自然的肌肤。 皮之不存，毛将焉附？！ 第一段将城市比作点缀在旷野的“银扣”，第十段却又将它比作楔入旷野的“巨钉”，这是为什么？
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