题目内容
设有关系R，S和T如下。关系T是由关系R和S经过 ______ 操作得到的。
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Facial expressions carry meaning that is determined by situations and relationships. For instance, in American culture the smile is typically an expression of pleasure. Yet it also has other functions. A smile may show affection, convey politeness, or disguise true feelings. It is also a source of confusion across cultures. For example, many people in Russia consider smiling at strangers m public to be unusual and even suspicious behavior. Yet many Americans smile freely at strangers in public places. Some Russians believe that Americans smile in the wrong place; some Americans believe that Russians don't smile enough. In Southeast Asian cultures, a smile is frequently used to cover emotional pain or embarrassment.
Our faces reveal emotions and attitudes, but we should not at tempt to "read" people from another culture as we would "read" someone from our own culture. The degree of facial expressiveness one exhibits varies among individuals and cultures. The fact that members of one culture do not express their emotions as openly as do members of another. does not mean that they do not experience emotions. Rather, there are cultural restraints on the amount of nonverbal expressiveness permitted.
If we judge people whose ways of showing emotions are different according to our own cultural norms, we may make the mistake of "reading" the other person incorrectly.
(27)
在C++语言中，不合法的实型数据的是
Task 2
Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.
For some employers, the policy of lifelong employment is particularly important because it means that they can put money and effort into their staff training and make them loyal to the company. What they do is to select young people who have potential and who can be trained. They then give the young people the kinds of skills that will make them suitable employees for the company. In other words, they adjust their training to their particular needs.
One recently employed graduate says that she is receiving a great deal of valuable training from the company. "This means that I will be a loyal employee", she says. "And it also means that the company will want to keep me. I am an important investment for them. So the policy is a good one because it benefits both the employer and the employee".
Recently, however, attitudes towards lifelong employment are beginning to change. Employees are slowly beginning to accept the idea that lifelong employment is not always in their best interest and that changing firms can have career advantages.
The purpose of lifelong employment is to ______.
He has established himself to be a competent manager by his successfully handling several
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