Air blowing from the intake air filter of an operating air compressor indicates ______.A.b

rom high-pressure to low-pressure areas.

A．primary air flow to cause

B．the primary cause of air flow

C．they primarily cause air flow

D．air flow has a primary cause

rom high-pressure to low-pressure areas.

A．primary air flow to cause

B．the primary cause of air flow

C．they primarily cause air flow

D．air flow has a primary cause

Some kinds of winds might cause illness or health problems, because().

A、winds from mountain regions blowing faster and faster warm and dry the air

B、researchers say there are more strokes and heart attacks during windy weather of this kind

C、bad headaches and asthma attacks are some possible examples of the effects of the winds

According to the speaker, why does coastal area receive more rain than land regions？

A．The ocean saturates the atmosphere with water.

B．More salt particles are suspenede in the air over the coast.

C．The dust from blowing sand causes moisture to condense.

D．Lower coastal elevations attract predictable weather patterns.

听力原文： Windbreaks are barriers formed by trees and other plants. Farmers plant these barriers around their fields to protect their land.

Windbreaks stop the wind from blowing soil away (33) . They also keep the wind from destroying or damaging crops. They are very important for protecting grain crops.

There have been studies done on windbreaks in parts of West Africa, for example. These found that grain harvests can be twenty percent higher in fields protected by windbreaks compared to fields without such protection (33) .

But windbreaks seem to work best when they allow some winds to pass through them (341. If the wall of trees and plants blocks the wind completely, then violent air motions will take place close to the ground. These motions will lift soil into the air where it will be blown away.

There should be at least two lines in each windbreak. one line should be large treas. The second line, right next to it, can be shorter trees and other plants with leaves. Locally grown trees and plants are best for windbreaks.

If the quality of the land is not very good, studies have shown that one kind of tree that can grow well is the white pine (35) .

Windbreaks not only protect land and crops from the wind. Surplus trees can be cut down and used to provide wood (33) .

(34)

A．They can prevent soil from being blown away.

B．They can improve the yield of crops.

C．They can provide wood when cut down.

D．They can protect crops from the strong sunshine.

听力原文： Recent research has claimed that an excess of positive ions in the air can have an ill-effect on people's physical or psychological health. What are positive ions？ Well, the air is full of ions, electrically charged particles, and generally there is a rough balance between the positive and the negative charges. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorms, earthquakes or when winds are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibers, or from TV sets, duplicators or computer display screens.

When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches, fatigue, irritability, and some particularly sensitive people suffer nausea or even mental disturbance. Animals are also found to be affected, particularly before earthquakes; snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs howl and cats jump about unaccountably. This has led the US Geographical Survey to fund a network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas such as California.

Conversely, when large numbers of negative ions are present, people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea, close to waterfalls or fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea, or in the mountains with tumbling streams or waterfalls.

(30)

A．They are becoming insane.

B．They feel rather bad-tempered.

C．They become violently aggressive.

D．They are suffering toothache.

telling how it had grown from a cutting she had brought years before from Italy, when she was first married. She and her husband had been travelling back in their carriage from Rome (it was before the time of railways ) and on a bad piece of road south of Siena they had broken down, and had been forced to pass the night in a little house by the road-side. The accommodation was wretched of course; she had spent a sleepless night, and rising early had stood, wrapped up, at her window, with the cool air blowing on her face, to watch the dawn. She could still, after all these years, remember the blue mountains with the bright moon above them, and how a far-off town on one of the peaks had gradually grown whiter and whiter, till the moon faded, the mountains were touched with the pink of the rising sun, and suddenly the town was lit as by an illumination, one window after another catching and reflecting the sun’s beam, till at last the whole little city twinkled and sparkled up in the sky like a nest of stars.

When a storm is blowing, what will happen？

A．The air will be still.

B．The air will be full of dust.

C．Faraway objects may look vague.

D．The pressure will drop.

第三节 短文理解2

阅读下列短文，从[A]、[B]、[C]三个选项中选择一个正确答案。

Last Sunday I saw the worst storm. It came suddenly and went on for more than three hours.

After lunch, I went into my room to have a rest. The air was hot, and everything was quiet. The strong wind started blowing into my room suddenly. Pieces of paper on my desk flew high into the air and some flew out of the open window. As I ran out to catch them, big drops of rain began to fall.

When I came back into the house, it was raining harder and harder. I tried very hard to close the window. Then I heard a loud crashing sound from the back of the house. I ran out of my room to find out what it was -- a big tree fell down and broke the top of the back room.

The storm happened ______ .

A．in the morning

B．in the afternoon

C．while I was in the back room

The process to remove exhaust gases by blowing in fresh air is called _____.

A.charging

B.supercharging

C.starting

D.scavenging