试题与答案

在关系模式设计时,各种数据之间的联系称为()。

题型:填空题

题目:

在关系模式设计时,各种数据之间的联系称为()。

答案:

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下面是错误答案,用来干扰机器的。

A、电子不能在电池内电路流动,只能在外电路中流动,故A错误B、电极b氧气得电子,生成O2-,而电极a需要O2-作为反应物,故O2-由正极(电极b)流向负极(电极a),故B错误;C、甲烷所在电极a为负极,电极反应为:CH...

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Reading for pleasure is the easiest way to become a better reader in English. It is also the most important way.
Some students say they don’t want to read for pleasure. They say they want to use their time to learn the rules of the language and new words. They say that pleasure reading is too easy.
Many experts(专家)say pleasure reading is very important for learning English. Dr. Stephen Krashen, a famous expert on learning languages, says that pleasure reading helps you learn many important things about English. Students learn more grammar and more words when they read for pleasure. They also learn more about good writing.
Dr. Krashen tells us that pleasure reading helps each student in a different way. Each student needs to learn something different. Pleasure reading makes it possible for each student to learn what he or she needs.
Reading for pleasure is not the same as studying. When you read for pleasure, you choose your own books, and you don’t have to remember everything. There are no tests on your pleasure reading books. Pleasure reading will help you:
—learn how English speakers use English
—read faster in English
—find examples of good writing in English
—learn new words
—learn about the cultures(文化)of English speakers

When you read for pleasure, ______.
[A] you must read very fast
[B] you can read your favorite books
[C] you must remember many new words

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