阅读理解

阅读下面短文，从每题所给四个选项中选出最佳答案。

　　Without the atmosphere there would be no weather, no wind, rain, snow, or clouds. Air is all around us; we live at the bottom of a great ocean of air. It is invisible, but we can feel it when it moves. There are miles of air above us, pressing down with great weight on the earth and everything on it. Because air presses down on us from all directions at the same time, and because we are able to bear(忍受) this weight, we do not seem to feel it. But scientists have proved that air has this weight, and that anything that has weight creates(产生) a force called pressure. As changes in air pressure take place, they make air move.

　　Air is a gas that expands(膨胀) when heated, gets lighter, and moves upward. When air is cooled, it gets heavier, sinks close to the earth's surface, and flows like water in a great river. As warm air rises, cold air rushes in to take its place. Thus winds originate(起源). The winds that blow high above us are caused by the warmer air running away from colder air. The wind we feel near the earth's surface is the heavy colder air trying hard to catch the warmer air. Changes in temperature cause the air to move. And of course there are many changes, so air movements are taking place practically all the time.

1．The first paragraph mainly tells us the causes of ________.

[　　]

A．why we don't feel air

B．why atmosphere is important to us

C．why there is air surrounding us

D．why there is air pressure

2．Air moves under such conditions that ________.

[　　]

A．there is air pressure

B．the air is heavy

C．air pressure doesn't remain the same all the time

D．air comes up and down

3．According to the passage, in some areas if farmers who grow grapes(葡萄) light fires in the early morning, that is because the farmers want to ________.

[　　]

A．drive away warm air

B．prevent cold air from coming to harm their plants

C．cause more wind

D．stop warm air running away

阅读理解。

阅读下面短文，从每题所给四个选项中选出最佳答案。

　　To be a good teacher, you need some of the gifts of a good actor: you must be able to hold the attention and interest of your audience; you must be a clear speaker, with a good, strong, pleasing voice which is fully under your control; and you must be able to act what you are teaching, in order to make its meaning clear.

　　Watch a good teacher, and you will see that he does not sit motionless before his class: he stands the whole time he is teaching; he walks about, using his arms, hands and fingers to help him in his explanations, and his face to express feelings. Listen to him, and you will hear the loudness, the quality and the musical note of his voice always changing according to what he is talking about.

　　The fact that a good teacher has some of the gifts of a good actor doesn't mean that he will indeed be able to act well on the stage, for there are very important differences between the teacher's work and the actor's. The actor has to speak words which he has learnt by heart; he has to repeat exactly the same words each time he plays a certain part, even his movements and the ways in which he uses his voice are usually fixed beforehand. What he has to do is to make all these care-fully learnt words and actions seem natural on the stage.

　　A good teacher works in quite a different way. His audience takes an active part in his play: they ask and answer questions, they obey orders, and if they don't understand something, they say so. The teacher therefore has to suit his act to the needs of his audience, which is his class. He cannot learn his part by heart, but must invent it as he goes along.

　　I have known many teachers who were fine actors in class but were unable to take part in a stage play because their brains wouldn't keep discipline: they could not keep strictly to what another had written.

1．What is the text about?

[　　]

A．How to become a good teacher.

B．What a good teacher should do outside the class.

C．What teachers and actors could learn from each other.

D．The similarities and differences between a teacher's work and an actor's.

2．In what way is teacher's work different from an actor's?

[　　]

A．The teacher must learn everything by heart.

B．The teacher knows how to control his voice better than an actor.

C．The teacher has to deal with unexpected situations.

D．The teacher has to use more facial expressions.

3．The main difference between students in class and a theatre audience is that ________.

[　　]

A．the students must take part in their teachers' plays

B．students must keep silent while theatre audience needn't

C．no memory work is needed for the students

D．students can move around in the classroom

4．Why does a good teacher make gestures while speaking?

[　　]

A．To make his meaning clearer.

B．To draw the attention of his class.

C．To express feeling more clearly.

D．All of the above.

5．Which of the following is true?

[　　]

A．Teachers have to learn by heart what they are going to say in class.

B．A teacher cannot decide beforehand what exactly he is going to say in class.

C．A teacher must speak louder and more clearly than an actor.

D．A teacher must have a better memory and better voice than an actor.