题目内容

某公司的业务员甲与客户乙通过Intemet交换商业电子邮件。为保障邮件内容的安全，采用安全电子邮件技术对邮件内容进行加密和数字签名。安全电子邮件技术的实现原理如图所示。
为图1—2中(1)一(4)处选择合适的答案。(1)一(4)的备选答案如下：DEs算法、MD5算法、会话密钥、数字证书、甲的公钥、甲的私钥、乙的公钥、乙的私钥。以下关于报文摘要的说法中正确的有(5) 。(5)的备选答案如下：A)不同的邮件很可能生成相同的摘要B)由邮件计算出其摘要的时间非常短C)由邮件计算出其摘要的时间非常长D)摘要的长度比输入邮件的长度长

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John can not afford a car,______(更不用说房子了).

Every international application on entering Moon River College starts from APPLICATION. What you need to know about application is, firstly, to apply early. Because space is limited in every college program and not every program accepts international students. Applying six months in advance will help you secure a space for the next academic year. It will also provide you with the time that may be required to apply for a Canadian Study Permit allowing you to come to Canada to study at Moon River College.
You need to read the admissions criteria (准则) carefully. Each program has its own set of entrance requirements. Here is also the Special Selection Criteria: entrance testing, an orientation session can be required for entrance to some programs. Apply early to ensure that there is enough time to complete your application and meet all of the selection criteria for the program of your choice.
Payments of the Application Fee and Tuition Deposit can be made by Visa, Master Card, Money Order, Bank Draft or Wire transfer payable to Moon River College. Application submitted without the $400 will not be accepted.
For more detailed information on the application process please refer to the application form. on the back pages of this View book.
Please note that the official transcripts (副本) or certifications must be originals or certified (合格) copies. They must indicate your academic standing and language proficiency. Certified translations of all academic documents should be provided when the originals are written in a language other than English.
Applying to Study at Moon River College
The first important thing to be known while applying is (46)
The information sources: (47)
Money paid when submitting application: (48)
Requirements for official transcripts or certificates: (49) and (50) .

The teacher writes with it on the blackboard.

"Stress"
Read a short passage and then listen to part of a lecture on the same topic.
Reading Time: 45 seconds
Stress
Stress is defined as a mental and physical condition that occurs when an adjustment or adaptation must be made to the environment. Unpleasant conditions or events cause stress, as, for example, financial problems, a divorce, health issues, or pressure at work. However, a certain amount of stress occurs even when the adjustment is to a condition that is perceived as desirable. Exercise, dating, moving to a new home, or taking a trip are all stressful situations. Although short-term stress is usually harmless, the consequences of long-term stress can be dangerous to health. Factors that decrease the consequences of stress are the ability to predict stressful situations and the level of control over them that can be achieved.
Now listen to part of a lecture in a psychology class. The professor is talking about an experiment.
Question
Explain the causes of stress and relate them to the experiment with rats.
Preparation Time:30 seconds
Preparation Time:60 seconds