阅读理解

　　If you travel by air across the centre of Africa or south.

　　America, you fly over forests for thousands of kilometres. These great forests are the oceans of trees. There are full of thousands and thousands of different kinds of plants and animals.

　　However, the worlds forests are getting smaller all the time. We are cutting down the trees because we need wood, and we need more farm land. Some people say that there will not be any forests like these in 20 or 30 years. What will happen if they disappear?

　　If we cut down our forests, a lot of plants and animals will disappear from the world. In a lot of places the new farm land will soon look like the old deserts. Crops will not grow there. It will not rain very often, and the weather will get very hot. Perhaps the climate of the world will change. This will be dangerous for everyone in the world. That is why we must take care of our forests.

1．The passage mainly tells us about ________.

[　　]

A．the importance of taking care of our plants

B．the result of cutting down the trees

C．the locations of great forests

D．the reasons for forming the deserts

2．Which of the following is true according to the passage?

[　　]

A．Africa and South America are the oceans of trees.

B．Forests are homes for different kinds of animals.

C．Forests are usually several square kilometres large.

D．Different plants can’t be found in the same forest.

3．The need for more wood and more land results in ________.

[　　]

A．the change of the world climate

B．the disappearance of many plants and animals

C．more deserts and less farm land

D．all of the above

4．What will happen in 20 or 30 years in some people’s view?

[　　]

A．We’ll have more and greater forests.

B．We’ll have enough land to support our people.

C．We’ll have no forests like those in the centre of Africa.

D．We’ll have enough wood to do some cooking.

5．The writer thinks ________.

[　　]

A．it dangerous for everyone to cut down the forests

B．it necessary for everyone to protect the forests

C．it impossible for everyone to take care of the world

D．it important for everyone to keep animals

Across countryside, non-food crops are growing alongside wheat．Some are used in new alternatives to plastics and other materials, but others will simply be burned．
Burning crops is becoming more popular because it is good for the planet．Doing so is also cheaper than burning fossil fuels．As more land is devoted to non-food crop production, the economics of crops for fuel are likely to become even more favorable．
Humans have been burning such biomass—organic materials from plants or animals— since they discovered fire．But that burning fossil fuels could have catastrophic consequences has brought biomass back into fashion．
Even allowing for emissions (排放) of carbon dioxide from fuel used in planting, harvesting, processing and transporting biomass fuel, replacing fossil fuel with biomass can typically reduce greenhouse gas emissions by more than 90 percent．
Power stations around the world are experimenting with forms of biomass to add to their coal or oil, with encouraging results．Indeed, power companies could profit by turning to biomass, especially when the subsidies (补助) many governments offer for using renewable energy are taken into account．
Farmers can benefit from growing biomass．In Europe, the reduction of subsidies for certain crops is exposing farmers to market forces．Instead of being paid for whatever they produce, farmers must seek a clear demand for their product．Many believe that the demand for alternatives to fossil fuels could be just such a driver．
But while biomass offers a variety of potential alternatives, the world's infrastructure (基础设施） has developed around burning fossil fuels to such a stage that switching to biomass involves a change in conception that many companies have not accepted．
Also, there are problems with using biomass．Although most coal-fired power stations could take a small amount of their fuel from biomass without significant adjustment, few are built to run on biomass alone．Burning some forms of biomass also causes environmental problems．Oils and waste can be smelly, while wood produces smoke unless burned properly．
The supply chains for fossil fuels are set up well, but those for biomass are just the beginning. Sources of supply for biomass rely on farm production and can therefore be less reliable. They are necessarily limited and it wouldn't make sense to turn a very large amount of valuable agricultural land away from food crops．But as the world adjusts to the need to control greenhouse gas emissions, these problems may receive more attention．
【小题1】What do we know about biomass?

Across countryside, non-food crops are growing alongside wheat．Some are used in new alternatives to plastics and other materials, but others will simply be burned．

Burning crops is becoming more popular because it is good for the planet．Doing so is also cheaper than burning fossil fuels．As more land is devoted to non-food crop production, the economics of crops for fuel are likely to become even more favorable．

Humans have been burning such biomass—organic materials from plants or animals— since they discovered fire．But that burning fossil fuels could have catastrophic consequences has brought biomass back into fashion．

Even allowing for emissions (排放) of carbon dioxide from fuel used in planting, harvesting, processing and transporting biomass fuel, replacing fossil fuel with biomass can typically reduce greenhouse gas emissions by more than 90 percent．

Power stations around the world are experimenting with forms of biomass to add to their coal or oil, with encouraging results．Indeed, power companies could profit by turning to biomass, especially when the subsidies (补助) many governments offer for using renewable energy are taken into account．

Farmers can benefit from growing biomass．In Europe, the reduction of subsidies for certain crops is exposing farmers to market forces．Instead of being paid for whatever they produce, farmers must seek a clear demand for their product．Many believe that the demand for alternatives to fossil fuels could be just such a driver．

But while biomass offers a variety of potential alternatives, the world's infrastructure (基础设施） has developed around burning fossil fuels to such a stage that switching to biomass involves a change in conception that many companies have not accepted．

Also, there are problems with using biomass．Although most coal-fired power stations could take a small amount of their fuel from biomass without significant adjustment, few are built to run on biomass alone．Burning some forms of biomass also causes environmental problems．Oils and waste can be smelly, while wood produces smoke unless burned properly．

The supply chains for fossil fuels are set up well, but those for biomass are just the beginning. Sources of supply for biomass rely on farm production and can therefore be less reliable. They are necessarily limited and it wouldn't make sense to turn a very large amount of valuable agricultural land away from food crops．But as the world adjusts to the need to control greenhouse gas emissions, these problems may receive more attention．

1.What do we know about biomass?

A．It is a useful way of burning crops．

B．It is plant and animal matter used to provide power．

C．It is a new alternative to be used widely．

D．It is a popular approach to fighting against pollution．

2.What are the advantages of using biomass?

a．It gives off less greenhouse gases．

b．It helps farmers receive subsidies for what they produce．

c．It has met the clear demand for energy．

d．It has brought subsidies for some power companies．

e．It is cheaper than burning fossil fuels．

A．a, b, c            B．b, c, d            C．c, d, e            D．a, d, e

3.For coal-fired power stations, ______．

A．more effective ways to use biomass have been tried

B．using renewable energy has become their daily task

C．burning biomass alone would require considerable changes

D．setting up dependable supply channels needs governments' support

4.What is the author's attitude towards biomass fuels?

A．Defensive．       B．Doubtful．        C．Negative．        D．Objective

Across countryside, non-food crops are growing alongside wheat．Some are used in new alternatives to plastics and other materials, but others will simply be burned．
Burning crops is becoming more popular because it is good for the planet．Doing so is also cheaper than burning fossil fuels．As more land is devoted to non-food crop production, the economics of crops for fuel are likely to become even more favorable．
Humans have been burning such biomass—organic materials from plants or animals— since they discovered fire．But that burning fossil fuels could have catastrophic consequences has brought biomass back into fashion．
Even allowing for emissions (排放) of carbon dioxide from fuel used in planting, harvesting, processing and transporting biomass fuel, replacing fossil fuel with biomass can typically reduce greenhouse gas emissions by more than 90 percent．
Power stations around the world are experimenting with forms of biomass to add to their coal or oil, with encouraging results．Indeed, power companies could profit by turning to biomass, especially when the subsidies (补助) many governments offer for using renewable energy are taken into account．
Farmers can benefit from growing biomass．In Europe, the reduction of subsidies for certain crops is exposing farmers to market forces．Instead of being paid for whatever they produce, farmers must seek a clear demand for their product．Many believe that the demand for alternatives to fossil fuels could be just such a driver．
But while biomass offers a variety of potential alternatives, the world's infrastructure (基础设施） has developed around burning fossil fuels to such a stage that switching to biomass involves a change in conception that many companies have not accepted．
Also, there are problems with using biomass．Although most coal-fired power stations could take a small amount of their fuel from biomass without significant adjustment, few are built to run on biomass alone．Burning some forms of biomass also causes environmental problems．Oils and waste can be smelly, while wood produces smoke unless burned properly．
The supply chains for fossil fuels are set up well, but those for biomass are just the beginning. Sources of supply for biomass rely on farm production and can therefore be less reliable. They are necessarily limited and it wouldn't make sense to turn a very large amount of valuable agricultural land away from food crops．But as the world adjusts to the need to control greenhouse gas emissions, these problems may receive more attention．

1. 1.

   What do we know about biomass?

   1. A.
      It is a useful way of burning crops．
   2. B.
      It is plant and animal matter used to provide power．
   3. C.
      It is a new alternative to be used widely．
   4. D.
      It is a popular approach to fighting against pollution．
2. 2.

   What are the advantages of using biomass?
   a．It gives off less greenhouse gases．
   b．It helps farmers receive subsidies for what they produce．
   c．It has met the clear demand for energy．
   d．It has brought subsidies for some power companies．
   e．It is cheaper than burning fossil fuels．

   1. A.
      a, b, c
   2. B.
      b, c, d
   3. C.
      c, d, e
   4. D.
      a, d, e
3. 3.

   For coal-fired power stations, ______．

   1. A.
      more effective ways to use biomass have been tried
   2. B.
      using renewable energy has become their daily task
   3. C.
      burning biomass alone would require considerable changes
   4. D.
      setting up dependable supply channels needs governments' support
4. 4.

   What is the author's attitude towards biomass fuels?

   1. A.
      Defensive．
   2. B.
      Doubtful．
   3. C.
      Negative．
   4. D.
      Objective