在双代号或单代号网络计划中，工作的最早开始时间应为其所有紧前工作( )。A．最早完

一个SQL语句原则上可产生或处理一组记录，而主语言一次只能处理一个记录，为此必须协调两种处理方式，这是通过使用______机制来解决的。

Learning a Second Language

Some people learn a second language easily. Other people have trouble learning a new language. How can you help yourself learn a new language, such as English? There are several ways to make learning English a little easier and more interesting.

The first step is to feel positive about learning English. If you believe that you can learn, you will learn. Be patient. You do not have to understand everything all at once. It is natural to make mistakes when you learn something new. We can learn from our mistakes. In other words, do not worry about taking risks,

The second step is to practice your English. For example, write in a journal, or diary, every day. You will get used to writing in English, and you will feel comfortable expressing your ideas in English. After several weeks, you will see that your writing is improving. In addition, you must speak English every day. You can practice with your classmates outside class. You will all make mistakes, but gradually you will become comfortable communicating in English.

The third step is to keep a record of your language learning. You can write this in your journal. After each class, think about what you did. Did you answer a question correctly? Did you understand something the teacher explained? Perhaps the lesson was difficult, but you tried to understand it. Write these accomplishments in your journal.

You must be positive about learning English and believe that you can do it. It is important to practice every day and make a record of your achievements. You will enjoy learning English, and you will feel more confidence in yourself.

66.To feel positive about learning English means _______.

A.if you are patient, you will learn

B.you can understand everything all at once

C.if you make mistakes, you can learn from your mistakes

D.if you believe you can learn, you will learn

67._____ follows in addition.

A.More information   B. The same information  C.The result  D. The opposite information

68.When you learn English, you do not need to ______.

A.be patient                        B. make mistakes

C. express your ideas in English        D. understand everything all at once

69.What is not helpful for you to enjoy learning English?

A.To communicate in English.                    B.To worry about taking risks.

C.To think about what has been done after each class.  D.To make a record of the achievements.

70.What is the main idea of this passage?

A.It is very important to learn a second language.

B.Some people learn a second language easily. Other people do not.

C.There are ways to help you learn a second language more easily.

D.Don’t worry about taking risks when learning a second language.

关于支原体肺炎肺外损害，下列哪项是错误的（）

A.主要发生于婴幼儿

B.一般于发病后10天左右

C.常见脑膜脑炎

D.可出现心肌炎

E.严重者可加用激素治疗

一个（）工人在一个工作地，对一个（）工件所连续完成的那部分机械加工工艺过程称为（）。

世界区域预报系统（WAFS）