Scientists who study the climate are still arguing about how fast the earth is warming and how much it will warm, but they do agree that the earth is warming and that it will keep warming if we don’t do anything about it.
Scientists agree that the burning of fossil fuels (化石燃料) like oil and coal cause greenhouse gases to escape into the air and that these gases are causing most of the warming. Another cause is deforestation (cutting down trees) . Trees soak up carbon dioxide, one of the greenhouse gases, from the air.
There are already some changes happening because of global warming. Sea level is rising and some animals are already moving to new homes. It’s already too late to stop global warming completely.
If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that is disappearing because they can’t move to new homes. There may be more storms and floods. Sea level may rise so much that people have to move away from the coasts. Some areas may become too dry for farming.
Global warming is a very difficult problem to fix. People are having a hard time agreeing on what to do about it. For example, everyone agrees that wasting energy is a bad thing to do. But some people think that the federal government (联邦政府) should make laws about it, while other people think it should be up to each person or business to decide what to do.
Many states and businesses in the United States are not waiting until the federal government decides what to do. They have already started working on the problem.
【小题1】What are the scientists arguing about in the passage?
A. How fast is the earth warming?                  B. How much will the earth warm?
C. The earth will keep warming if we don’t do anything about it.    D. Both A and B.
【小题2】What does the underlined phrase “soak up” mean?

Scientists who study the climate are still arguing about how fast the earth is warming and how much it will warm, but they do agree that the earth is warming and that it will keep warming if we don’t do anything about it.

Scientists agree that the burning of fossil fuels (化石燃料) like oil and coal cause greenhouse gases to escape into the air and that these gases are causing most of the warming. Another cause is deforestation (cutting down trees) . Trees soak up carbon dioxide, one of the greenhouse gases, from the air.

There are already some changes happening because of global warming. Sea level is rising and some animals are already moving to new homes. It’s already too late to stop global warming completely.

If the warming gets worse, as scientists expect, there may be some kinds of plants and animals that is disappearing because they can’t move to new homes. There may be more storms and floods. Sea level may rise so much that people have to move away from the coasts. Some areas may become too dry for farming.

Global warming is a very difficult problem to fix. People are having a hard time agreeing on what to do about it. For example, everyone agrees that wasting energy is a bad thing to do. But some people think that the federal government (联邦政府) should make laws about it, while other people think it should be up to each person or business to decide what to do.

Many states and businesses in the United States are not waiting until the federal government decides what to do. They have already started working on the problem.

1.What are the scientists arguing about in the passage?

A. How fast is the earth warming?                  B. How much will the earth warm?

C. The earth will keep warming if we don’t do anything about it.    D. Both A and B.

2.What does the underlined phrase “soak up” mean?

A．take in            B．grow up           C．take off           D．set up

3.What may be the causes of global warming?

A．The disappearance of plants and animals and the wasting energy.

B．The burning of fossil fuels and storms and floods.

C．The burning of fossil fuels and deforestation.

D．The rising of sea level and deforestation.

4.What is the best title of this passage?

A．The reason for global warming             B．How to stop global warming

C．The changes to the world                 D．The global warming

Today we can see that many people are cutting ___41___ the trees in the forests. A lot of rich land ___42__ become deserts(沙漠). If we __43　 newspapers, we’ll learn that the forests on the earth are getting smaller 　 44　 . We are cutting down large numbers of trees 　 45　 we need wood and farmland. Some scientists say that there ____46___ be any great forests 　 47　 20 or 30 years.

What will happen 　 48　 the forests disappear? A lot of plants will die and the animals will 　 49　 their home. In many places the new farmland will soon look____50____ the old deserts. Crops（庄稼） will not grow there. There won’t be enough 　51　 , and the weather will get hot and dry. If the climate（气候）of the earth changes, life will be 　52　 for everyone. Our living environment（环境） will become 　53 . More and more rich farmland will disappear（消失）. We will suffer（遭受）a lot from both droughts（干旱） and floods.

It’s our duty___54___the forests well. Everyone should try his best to make a contribution（贡献） to taking ___55___ of the forests. Stop cutting down the trees and make the world greener!

(　 )41. A.down 　　　　　　　　　　 　　　 B.up　　　　　　　　　　 　　　 C.off　　　　　　　　　　 　　　 D.of

(　 )42. A.have　　　　　　　　 　　　 B. has 　　　　　　　　 　　　 C.is　　　　　　　　　　　 　　　 D.are

(　 )43. A. look　　　　 　 　　　 B. see　　　　　　　　　 　　　 C. read　　　　　　　　 　　　 D. watch

(　 )44. A. on time B. all the time 　 　　　 C. in time D. no time

(　 )45. A. or　　　　　　　　　 　　　 B. so　　　　　　　　　　 　　　 C. because　　　　　　 　　　 D. but

(　 )46. A.is　　　　　　　　　　 　　　 B.are　　　　　　　　　　 　　　 C. will not 　　　　　 　　　 D.have

(　 )47. A. in　　　　　　　　　　 　　　 B. at　　　　　　　 　 　　　 C. on　　　　　　　　　 　　　 D. with

(　 )48. A. and　　　　　　　　 　　　 B. that　　　　　 　 　　　 C. but　　　　　　　　　 　　　 D. if

(　 )49. A. find B. build　　　　 　 　　　 C. lose D. decorate

(　 )50. A. like 　　　　　　　　 　　　 B.at　　　　　　　　　　　 　　　 C.after　　　　　　　　 　　　 D.for

(　 )51. A. snow　　　 　　　　　　 B. sunshine　　 　 　　　 C. wind　　　　　　　　 　　　 D. rain

(　 )52. A. easy B. hard　　　　　 　 　　　 C. happy　　　 　 　　　 D. interesting

(　 )53. A. better and better B. worse and worse

C. bigger and bigger D. more and more

(　 )54.A. to do B. do C. to protect D. protect

(　 )55. A. care 　　　　　　　 　　　 B.careful　　　　　　　 　　　 C.careless　　　　　　 　　　 D.good

　　There are some places in the world where great cities once stood. There were gardens, trees and grass. But now these cities have gone and the places are like deserts. Scientists began to study this land to find out what happened. Many of them believed the land died when the trees were cut down.

　　Trees help other plants grow and help hold the soil in place. They keep the soil from blowing away. The leaves of trees on the ground keep rainwater from running off. Trees near farms protect(保护) growing plants from strong winds.

　　Once there were hundreds of farms in the Southwestern United States. Then the farms turned into fields of dry dust(尘土). Trees might have saved these farms. But few trees grow in the dry southwest now.

　　Now we try to save trees. In many places, when a tree is cut down, a new tree is planted in its place. We do not want the land to die.

1．Places where great cities once stood are now like ________.

[　　]

2．What can trees do according to(根据) the passage?

[　　]

A．Trees can keep other plants green.

B．Trees can help other plants grow.

C．Trees can help the land grow.

D．Trees can keep other plants in place.

3．Which of the following sentences is true?

[　　]

A．Trees let the rainwater run off.

B．All the farms in the United States have turned into deserts.

C．There aren't any trees in the dry southwest now.

D．Land will die if there are no trees.

4．The main idea of the passage is ________.

[　　]

A．that farms are better than cities

B．how farms turned into deserts

C．that trees are important to the land

D．how people save trees

5．From the passage we know that ________.

[　　]

A．trees can blow soil away

B．man should protect the land

C．trees grow only in deserts

D．trees die easily