常规ABO正反定型应采用的试验方法是( )A．低离子强度盐水试验B．盐水介质法C．

红利收益率通常和公司增长能力呈反向变化关系。( )

阅读理解。

     Howling is a behavior commonly observed among a wolf pack. As pack animals, wolves work together

to hunt and rely on howling as an important means of communication among each other. There are different

explanations of a wolf's howl and it appears that there may be more to discover.

     One theory is that wolves howl to bond better together. It's almost as if howling together helps the pack

stay together. Perhaps something is similar to people feeling a sense of involvement with each other when

singing a song together. But this theory may be wrong, explains Fred H. Harington, a professor who studies

wolf behavior.

     Indeed, there have been times when wolves have been seen one moment howling in a chorus, and the

next, quarreling among each other. It appears that usually the lowest-ranking members of the pack may

actually be "punished" for joining in the chorus at times. So is howling a way to strengthen a social bond or

just a way to reconfirm status among its members? - Why do wolves howl for sure?

     What is clear, however, is that howling is often used among packmates to locate each other. Hunting

grounds are distant and it happens that wolves may separate from one another at times. When this happens,

howling appears to be an excellent means of gathering.

     Howling, interestingly, is a contagious behavior. When one wolf starts to howl, very likely others will

follow. This is often seen to occur in the morning, as if wolves were doing some sort of "roll call" where

wolves all howl together to report their presence.

1. What the possible similarity between wolves' howling together and human's singing in chorus?

A. The act of calling each other.

B. the sense of accomplishment.

C. The act of hunting for something.

D. The sense of belonging to a group.

2. Why does Harrington think the "social bond" theory may be wrong?

A. Wolves separate from each other after howling.

B. Wolves tend to protect their hunting grounds.

C. Wolves sometimes have quarrels after howling together.

D. Wolves of low rank are encouraged to join in the chorus.

3. Researchers are sure that wolves often howl to _____.

A. show their ranks

B. find their companions

C. report the missing ones

D. express their loneliness

4. "Howling… is a contagious behavior" (in the last paragraph) means _____.

A. howling is a signal for hunting

B. howling is a way of communication

C. howling often occurs in the morning

D. howling spreads from one to another

[Java 源程序：一个简单的Web服务器] /************************************************************/ /* WebServer.java* / /************************************************************/ package objclass； import java.net. * ； import java.io. * ； public class WebServer { public static final int PORT=8080；//Web 服务器侦听的端口号 public static final String WEB_ROOT= System.getProperty(“user。dir”)+File.separator+“webroot”； //WEB_ROOT 变量存放Web服务器工作目录，该目录存放HTML、GIF图片等静态文件资源 private static final String SHUTDOWN_COMMAND=“/shutdown”； //SHUTDOWN_COMMAND变量保存关闭服务器的命令 private boolean shutdown=falset//是否收到关闭服务器命令的标志 public static void main(String[] args) { WebServer server=new WebServer()； server.await()； } public void await(){ Serversocbet serverSocket=null try{serversocket=new (1) ； //创建侦听端口号为PORT的Serversocket类型的对象System.out.println(“WebServer Started!”)； }cateh(10Exceptione){e.printStackTrace()；System.exit(1)； } while(! shutdown) { //循环等待客户端连接Socket socket=nullInputStream input=null；OutputStream output=null；try{socket= (2) ； //创建来自客户端的连接套接宇input=SOCket． (3) ， //创建输入流output=SOCket． (4) //创建输出流Request request=new Request(input)；//创建Request对象request． (5) ； //解析客户端HTTP请求Responseresponse＝new Response(output)； //创建Response对象response.setRequest(request)； //将Request对象传递给Response对象response (6) ； //给客户端发送所请求的静态资源(7) ， //关闭连接套接字shutdown=request． (8) ．equals(SHUTDOWN_COMMAND)； //判断当前HTTP请求中的URI是否是关闭服务器命令 } } }} /************************************************************/ / * Request.java */ /************************************************************/ package objclass； import java.io.InputStream； import java.io.IOException； public class Request { private InputStream input； private String uri； public Request(InputStream input) { this.input=input；} public void parse() {... parseUri()；...}//解析客户端HTTP请求消息 private String parseUri(String requestString) {... } //解析客户端HTTP请求中的URI public String getUri() {return uri；} } /************************************************************/ / * Response.java */ /************************************************************/ package objclass； import java.io. * ； public class Response { private static final int BUFFER_SIZE=1024； Request request； OutputStream output； OutputStream output； public Response(OutputStream output) {this.output=output；} public void setRequest(Request request) {this.requdst=request；} public void sendStaticResouree() throws IOException{... } //向客户端发送所请求的表态源 } [运行测试] 在本机运行WebServer程序，然后打开n浏览器。 (1)在IE地址栏中，输入请求“/index．html"页面的命令： (9) ； (2)在IE地址栏中，输入关闭Web服务器的命令： (10) 。

事故应急救援体系响应程序的( )阶段主要包括现场清理、人员清点和撤离、警戒解除、善后处理和事故调查等。

A．应急恢复
B．救援行动
C．应急结束
D．应急启动

在没有流动水洗手的情况下，也可使用手消毒液。