Have you ever noticed the colour of the water in a river or stream after a heavy rainfall? What do you think caused this change in colour? It is soil that has been washed into the river from the riverbank or from t}le nearby fields．

Components of Soft

    Soil is made up of a number of layers(層)，each having its own distinctive colour and texture．The upper layer is known as the litter．It acts like a blanket．limiting temperature changes and reducing water loss．The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖質(zhì))，which is black and gives the topsoil its dark colour．This layer is usually rich in nutrients，oxygen，and water．Below the topsoil is the subsoil，a layer that contains more stones mixed with only small amounts of organic matter．This layer is lighter in colour because of the lack of humus．Beneath the soil lies a layer of bedrock．

    Soil forms from the bottom up．Over time bedrock is attacked by rain, wind，frost, and snow．It is gradually broken down into smaller particles in a process called weathering．Plants begin to grow，and rotten materials enrich the topsoil．Most of the soil in Eastern Canada．for example．Was formed from weathered rock that was exposed when the ice disappeared l2．000 years ag0．

Water Beneath the Soil

    Surface water collects and flows above the ground in lakes．ponds．a(chǎn)nd rivers．Once in the soil or rock，it is called groundwater．Gravity pulls groundwater through the soil in a process called percolation(滲透)．Eventually the water reaches a layer called the water table．Under this is bedrock through which water cannot percolate．

    As water percolates downward，it dissolves organic matter and minerals from the soil and carries them to deeper layers．This causes a serious problem because plants require these nutrients for growth.

Soil pH

    Soil can be acidic．neutral．or basic．The pH of the soil is determined by the nature of the rock

from which it was formed．a(chǎn)nd by the nature of t}le plants that grow and rot in it．

    The acidity of rain and snow can lower the pH of the groundwater that enters the soil．By burning fossil fuels such as coal，oil and gasoline，humans have been contributing to higher levels of acidity in many soils．When fossil fuels are burned．gases are released into the air and then fall back to earth as acid rain．Acid soil increases出e problem of carrying nutrients to lower soil levels．As nutrients are removed，soil is less fertile．Plants grow more slowly in acidic soil，and also become easily attacked by diseases．

67．The layer of soil that provides necessary nutrients for plant growth is called．

    A．1itter    B．topsoil    C．humus D．subsoil

68．According to the text．which of the following is NOT true?

    A．Soil forms from weathered rock on the earth surface．

  B．The deeper layer of soil is darker in colour than t}le surface soil．

  C．Air pollution is partially responsible for acid soil．

    D．Groundwater tends to carry away nutrients for plant growth．

69．We can infer from the passage that the water table lies       ．

A．between the topsoil layer and the subsoil layer

B．in the subsoil layer above bedrock

       C．between the subsoil layer and bedrock

       D．in the bedrock layer beneath the subsoil

70．The underlined word “dissolve” is used to express the idea that organic matter and minerals from soil are          ． 

    A．rushed away into the river

    B．cleaned and purified by water

    C．destroyed and carried away by water

    D．mixed with water and become part of it

In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping.

　　 According to a weather expert' s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere (北半球), possibly resulting in an alteration of the earth's chief food growing zones.

　　  In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.

　　  Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.

　　  However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude , therefore, that up to now natural influences on the weather have gone beyond those caused by man. The question is: Which natural cause has most effect on the weather?

　　  One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates (使旋轉(zhuǎn)), every 27. 5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth's atmospheric pressure, and consequently on wind circulation. The sun is also changeable over a long term: its heat output goes up and down in cycles, the latest trend being downward.

　　  Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia (慣性) of the earth's climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun's fading heat .

66. It can be concluded that a concentration of carbon dioxide in the atmosphere would_________.

   A. mean a warming-up in the Antarctic

   B. raise the temperature of the earth' s surface

C. prevent the sun's rays from reaching the earth's surface

D. explain the cause of  great changes in the climate in the northern hemisphere

67.The article was written to explain ___________. 

A. the greenhouse effect

B. the solar effects on the earth

C. the causes affecting weather

D. the models of solar-weather interactions

68. Although the fuel consumption is greater in the northern hemisphere, temperatures there　seem to be falling. This is__________.

 A. mainly because the levels of carbon dioxide are rising

 B. partly due to changes in the output of solar energy

C. possibly because the ice caps in the poles are melting

D. only due to the effect of the inertia of the earth' s climate

69. On the basis of their models, scientists believe the opinion that__________.

A. the climate of the world should be becoming cooler

B. the new Ice Age will be delayed by the greenhouse effect

C. the man-made warming effect helps to increase the solar effects

D. it will take thousands of years for the inertia of the earth's climate to take effect

70. If the assumption about the delay of a new Ice age is correct, ____________.

A. ice would soon cover the northern hemisphere

B. the greenhouse effect could work in favor of the earth

C. the best way to overcome the cooling effect would be to burn more fuels

D. the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly

閱讀下列短文，并根據(jù)所讀內(nèi)容在文章后表格中的空格里填入最恰當(dāng)?shù)脑~。注意： 每個(gè)空格不超過3個(gè)單詞。

   We’ve all been hurt by another person at one time or another. This pain causes problems. It not only causes us to be unhappy, but can ruin relatioships, distract(使分心) us from work and family and other important things, make us unwilling to open up new things.

We need to learn to let go. We need to be able to forgive, so we can move on and be happy. Forgiveness does not mean you erase the past, or forget what has happened. All it means is that you are letting go of the anger and pain, and moving on to a better place.

It’s not easy, but you can learn to do it.

Think about the advantages and disadvanges. Think of all the problems this pain causes you, and realize you need to change. Then think of the benefits of forgiveness—— how it will make you happier, free you from the past and the pain, and improve your relationships and life in general.

Try to put yourself in that person’s situation. Try to understand why the person did what he did. What could he have felt as he did it, and what did he feel afterward? How does he feel now? You aren’t saying what he did is right, but are trying to understand instead.

     Understand your responsibility. Try to figure out how you could have been partly responsible for what happened. This isn’t to say you’re taking all the blame, or taking responsibility away from the other person, but to realize that we are not victims but participants in life.

     Allow peace to enter your life. As you focus on the present, try focusing on your breathing. Imagine each breath going out is the pain and the past, and imagine each breath coming in is peace, entering you and filling you up.

Title: How to let go and forgive

第二節(jié) 簡答題（共3小題；每小題1.5分，滿分4.5分）

Tsunamis (海嘯) are a series of huge waves created by an underground movement such as an earthquake or a volcanic eruption (火山噴發(fā)) . A tsunami can travel hundreds of miles per hour in the open ocean and hit the land with huge waves.

From the area where the tsunamis come, waves travel in all directions. Once the waves approach the coast, they will become more than 100 feet in height. The topography (地形) of the coastline and the ocean floor will influence the size of the wave. There may be more than one wave and the latter one may be larger than the one before. That is why a small tsunami at one beach can be a huge wave a few miles away.

All tsunamis are dangerous, even if they may not damage every coastline they strike. A tsunami can strike anywhere along most of the US coastline. Many harmful tsunamis have occurred along the coasts of California, Oregon, Washington, Alaska and Hawaii.

A movement of the ocean floor, caused by earthquakes, most often causes tsunamis. If a tsunami occurs close to a coast, the first wave could reach the beach in a few minutes, even before a warning is given. Areas are at greater risk if they are less than 25 feet above sea level and within a mile of the coastline. Drowning is the most common cause of death during a tsunami. Tsunami waves are very harmful to buildings. Other dangers include floods, pollution of drinking water, and fires from gas lines.

An accurate prediction (預(yù)報(bào)) system will allow authorities (官方) to issue timely warnings and save lives in the event of a shore-bound tsunami. But forecasting tsunamis accurately is very difficult because the ocean is usually calm before they strike land.

65. What can cause tsunamis according to the passage? ( 回答詞數(shù)不超過6個(gè) )

______________________________________________________________________________

66. What harm can a tsunami bring besides killing people and damaging buildings? ( 回答詞數(shù)不超過15個(gè) )

______________________________________________________________________________

67. Why is it very difficult to forecast tsunami accurately ? ( 回答詞數(shù)不超過9個(gè) )

______________________________________________________________________________

簡答題（共3小題；每小題1.5分，滿分4.5分）

Tsunamis (海嘯) are a series of huge waves created by an underground movement such as an earthquake or a volcanic eruption (火山噴發(fā)) . A tsunami can travel hundreds of miles per hour in the open ocean and hit the land with huge waves.

From the area where the tsunamis come, waves travel in all directions. Once the waves approach the coast, they will become more than 100 feet in height. The topography (地形) of the coastline and the ocean floor will influence the size of the wave. There may be more than one wave and the latter one may be larger than the one before. That is why a small tsunami at one beach can be a huge wave a few miles away.

All tsunamis are dangerous, even if they may not damage every coastline they strike. A tsunami can strike anywhere along most of the US coastline. Many harmful tsunamis have occurred along the coasts of California, Oregon, Washington, Alaska and Hawaii.

A movement of the ocean floor, caused by earthquakes, most often causes tsunamis. If a tsunami occurs close to a coast, the first wave could reach the beach in a few minutes, even before a warning is given. Areas are at greater risk if they are less than 25 feet above sea level and within a mile of the coastline. Drowning is the most common cause of death during a tsunami. Tsunami waves are very harmful to buildings. Other dangers include floods, pollution of drinking water, and fires from gas lines.

An accurate prediction (預(yù)報(bào)) system will allow authorities (官方) to issue timely warnings and save lives in the event of a shore-bound tsunami. But forecasting tsunamis accurately is very difficult because the ocean is usually calm before they strike land.

65. What can cause tsunamis according to the passage? ( 回答詞數(shù)不超過6個(gè) )

66. What harm can a tsunami bring besides killing people and damaging buildings? ( 回答詞數(shù)不超過15個(gè) )

67. Why is it very difficult to forecast tsunami accurately ? ( 回答詞數(shù)不超過9個(gè) )