Very high waves are destructive when they strike the land. Fortunately, this seldom happen

From the second paragraph we know that high waves striking the shore are ______.

A．gradually reduced

B．difficult to predict

C．still very powerful

D．sometimes quite weak

What can we learn about the tsunami waves generated by the earthquake？ ()

A． The tsunami waves as high as 25 meters arrived immediately after the earthquake．

B． The tsunami waves killed 200 people and sank all the boats．

C． The tsunami waves were very destructive．

D． The tsunami waves flooded half of the inland．

Task 2

Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.

Very high waves are destructive when they strike the land. Fortunately, this seldom happens. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.

But the power of waves striking the shore can still be very great. During a winter gale, waves sometimes strike the shore with the force of 6,000 pounds for each square foot. That means a wave, 25 feet high and 500 feet along its face, may strike the shore with a force of 75 million pounds.

Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most raging storms, the water a hundred fathoms(600 feet) beneath the surface is just as calm as on a day without a breath of wind.

According to the passage, destruction caused by high waves occurs ______.

A．regularly

B．rarely

C．always

D．predictably

ed. One reason is that out at sea, waves moving in one direction almost always run into waves moving in a different direction. The two sets of waves tend to cancel each other out. Another reason is that water is shallower near the shore. As a wave gets closer to land, the shallow bottom helps reduce its strength.

But the power of waves striking the shore can still be very great. During a winter gale(大风), waves sometimes strike the shore with the force of 6,000 pounds for each square foot. That means a wave, 25 feet high and 500 feet along its face, may strike the shore with a force of 75 million pounds.

Yet the waves, no matter how big or how violent, affect only the surface of the sea. During the most violent storms, the water a hundred fathoms(600 feet) beneath the surface is just as calm as on a day without a breath of wind.

According to the passage, destruction caused by high waves occurs ______.

A．regularly

B．rarely

C．frequently

D．suddenly

The waves () high and the wind howled.

A. rose

B. risen

C. arose

D. raised

TOPPLE，TUMBLE AND ROLL OVER；SPRAY MAY AFFECT VISIBILITY．This condition is likely to be termed ______．

A.Strong breeze

B.Near gale

C.Gale

D.Strong gale

Microwave communication uses high-frequency(56)waves that travel in straightlines through the air. Because the waves cannot(57)with the curvature of the earth, they can be(58)only over short distance. Thus, microwave is a good(59)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(60).These can be installed on towers, high buildings, and mountain tops.

A．optical

B．radio

C．electrical

D．magnetic

From your reading of the passage, which of the following is tree？

A．At a depth of 1,200 feet the effects of a violent surface storm are frightful.

B．A submarine commander navigating his vessel at a depth of 700 feet will not be affected by a ranging surface storm.

C．A typhoon 500 miles out at sea can stir up the ocean floor.

D．If high waves can strike the shore with a horizontal force of 75 million pounds, the vertical force of such waves can have an even greater effect upon the ocean floor.

ch longer than that of sunrays. These longer heat waves cannot pass through the atmosphere as easily as the short waves coming from the sun. Similarly, radio stations that transmit programs to distant countries broadcast in short waves, which can travel all around the world. Stations that broadcast local programs send out longer waves, which can be received more easily, but only in a limited area.

(83) Heat waves, rising from the earth, meet resistance in the atmosphere from the water vapor there. Many if the waves are stopped by the water vapor can not get back out into space. The atmosphere, when it is warmed up, also adds some heat back to the earth's surface.

When the sun's rays strike water surface, some of the water becomes absorbed by the air as water vapor. The warmer the air is, the more vapor it can hold. When the air has absorbed its maximum amount of vapor, it is said to be saturated. If the air is then cooled, some of the vapor will condense and clouds will form. (84)These clouds, will contain drops of water at temperatures above freezing, or ice crystals at temperatures below freezing.

Clouds can greatly affect the temperature of the earth's surface. When there are many clouds in the sky, all of the sun's rays can not reach the earth. The cloudy day, then, will be cooler than the cloudless day. Clouds also prevent the earth from cooling off rapidly at night. For this reason, countries such as the British Isles, which are often covered by clouds, have a relatively constant temperature. The weather in these cloudy areas is neither very hot in summer nor very cold in winter. On the other hand, places such as deserts, which have few or no clouds, have very sharp variations in temperature—between night and day as well as between summer and winter.

Radio stations that transmit programs to distant countries send out waves that resemble______.

A．heat waves rising from the earth

B．waves absorbed by water vapor

C．waves sent out by radio stations that transmit local programs

D．the rays sent out from the sun

Reading Comprehension

Directions:There are two passages in this part．Each passage is followed by some questions or unfinished statements． For each of them there are four choices marked A,B,C and D． Youshould decide on the best choice．

Questions 56- 60 are based on Passage One:

Passage One

The largest earthquake (magnitude里氏9．5)of the 20th century happened on May 22,1960 0ff the coast of South Central Chile．

It generated(生成) one of the most destructive Pacific-wide tsunami（海啸）． Near the generating area, both the earthquake and the tsunami were very much destructive, particularly in the coastal area from Concepcion to the south end of Isla Chiloe．The largest tsunami damage occurred at Isla Chiloe-the coastal area closest to the epicenter(震中)．Huge tsuna- mi waves measuring as high as 25 meters arrived within l0 to 15 minutes after the earthquake, killing at least two hundred people, sinking all the boats, and flooding half a kilometer inland．

There was large damage and loss of life at Concepcion, Chile's top industrial city．Near the city of Valdivia, the earthquake and following aftershocks generated landslides which killed 18 people． At the port city of Valparaiso, a city of 200,000, many buildings collapsed． A total of 130,000 houses were destroyed-one in every three in the earthquake zone and nearly 2,000,000 people were left homeless．

Total damage losses, including agriculture and industry, were estimated(估计） to be over a half billion dollars． The total number of deaths related with both the tsunami and the earthquake was never found accurately for the region． Estimates of deaths reached between 490 and 57,002 with no distinction(差别) as to how many deaths were caused by the earthquake and how many were caused by the tsunami． However, it is believed that most of the deaths in Chile were caused by the tsunami．

Where did the largest tsunami damage occur？ ()

A． Concepcion

B． Isia Chiloe

C． Valdivia

D． Valparaiso

A.high

B.highly

C.height

D.a little high