对于邮政专用车辆持有的免费通行证，应当在该通行证上注明（）内容。A.车牌号 B.运行

下列有关生物多样性的叙述，正确的是（　　）

A．生物多样性的实质是基因的多样性

B．建立自然保护区是保护生物多样性最为有效的措施

C．当基因的多样性发生变化时，不会影响到生态系统的多样性

D．保护生物多样性的根本措施是保护生物的栖息环境以及生态系统的多样性

Section C 

Directions: Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need.

A．The factors leading to a good speaker

B．The importance of enunciation

C．Talk with strangers

D．Pronunciation, the other important assistant in conversationE. A famous master of conversation

F. The great use of dictionary

1. _________________________

The ancient Greeks were very good at making conversations, and the greatest talker of them all was philosophers Socrates. His student Plato surpassed some of his supposed conversations, and we read them in The Dialogue of Plato. In many classrooms today, Socrates’ method of teaching is used.

2. _________________________

The best talkers appear to have had a great interest in and love for their follow creatures, a curiosity about the world in general, some powers of observation and tolerance for those of others, and quick thinking. And they talk for the fun of it, not to show off their knowledge.

3. _________________________

A good voice must have the help of good speech, whose two assistants are clear enunciation and correct pronunciation. Poor enunciation may suggest to your listeners that you lack consideration, and that you are not especially concerned about their opinion of you.

4. _________________________

Pronunciation is settled by common agreement of the community of group speaking the particular language or dialect. For standard pronunciations of words, a dictionary is your best friend.

5. _________________________

Think of meeting a stranger as a chance to have a good time to talk, to make a friend. Look with a smile directly into the other’s eyes when you are introduced, and shake hands with a firm, friendly clasp (紧握). This will give you confidence. Then try to have a smooth and pleasant conversation with him.

抛出异常、生成异常对象都通过下列( )语句实现。

A．throws

B．throw

C．Throwable

D．Exception

怎样的学生宿舍容易发生被盗？（）

A、管理松懈制度不严

B、同学们警惕很高

C、有人值班管理

换热器工作中的泄漏点有那些检查方法？