脓胸的病理病理变化过程可分为3个时期：（）、（）和（）。

RSA是一种公开密钥加密算法。假定表示利用X的密钥Y对消息M进行加密，表示利用X的密钥Y对消息M进行解密，其中Y=P表示公钥，Y=S表示私钥。A利用RSA进行数字签名的过程可以表示为（1），A利用RSA实施数字签名后不能抵赖的原因是（2）。

（1）处填（）。

A.A

B.B

C.C

D.D

二审法院经过审理后根据案件的情况分别作出的处理为()。

A、即原判认定事实清楚，适用法律正确的，判决驳回上诉，维持原判

B、如原判决适用法律错误的，依法改判

C、即原判决违反法定程序，可能影响案件正确判决的，裁定撤销原判决，发回原审人民法院重审

D、原判决认定事实错误或原判决认定事实不清，证据不足，裁定撤销原判，发回原审人民法院重审，或查清事实后改判

E、不得就同一诉讼标的，以同一事实和理由再行起诉

Most of us fear getting up and speaking in public. Many people don’t like to go gathering where they don’t know anyone, but while most of us soldier on (迎难而上), those with social anxiety disorder are often stopped by the terror and worry.

Research shows that around fifteen million Americans suffer from social anxiety disorder. People in this condition feel that they are always being watched. Even though they know these fears are unreasonable, they cannot overcome their fears on their own.

Social anxiety disorder sufferers are often misdiagnosed with conditions such as schizophrenia (精神分裂症) and personality disorder. Many feel lonely, and are unsure whether anyone else can understand their thoughts and emotions. This can lead to withdrawal from most social situations, even to being unable to hold employment.

Those who suffer from social anxiety disorder are often dismissed(辞退)as being shy. This is simply not the case; shyness is not even a symptom of social anxiety disorder. The majority of sufferers find their symptoms linked to specific situations, rather than all types of social interactions.

An important step in overcoming social anxiety disorder is seeking out a therapist who specializes in training this type of disorder. Group treatment has been shown to be especially effective. Medication also help reduce the symptoms, but it should not be used as a replacement for psychotherapy (心理疗法).

On your own, you can help reduce the symptoms by taking deep breaths and practising medication or prayer. Alcohol and nicotine should be avoided, as both can cause panic attacks. Exercises can relieve the symptoms, because it burns up the chemicals in your body that cause stress.

54.Patients with social anxiety disorder_________________.

A. are shy in all situations

B. feel they don’t understand themselves

C. are anxious and terrified while speaking in public

D. feel it is unreasonable to be watched by others

55. We know from the passage that___________________________________.

A. most people will try to fight against social anxiety disorder

B. shyness is the main symptom of social anxiety disorder

C. people who feel lonely are often misdiagnosed with social anxiety disorder

D. psychotherapy is very important in treating social anxiety disorder

56. According to the passage, if Jack suffers from social anxiety disorder, he should_________.

A. burn up some unsafe chemicals             B. ask for help from a doctor

C. practise speaking in public                 D. resign from his present job

57. We are most likely to find this passage in__________.

A. American Culture                        B. Cross Country

         C. Family Doctor                          D. English Nature

简述零售业的主要特点

60kg/m及以上钢轨，在允许速度大于120km/h辙叉心垂直磨耗（不含翼轨加高部分）其他正线上超过6mm为（）。