The Earth has warmed by about half a degree（0．50℃）over the last 100 years．It could be getting warmer on its own，but many scientists think that people are making the Earth warmer by making a greenhouse effect（溫室效應(yīng)）．The greenhouse effect is important． Without it，the Earth would not be warm enough for us to live on．But just a little warmer than it is now could cause（引起）problems for humans，plants and animals．

Many of the things we do every day can change the Earth’s temperature by sending greenhouse gases（廢氣） into the air．We send greenhouse gases into the air When we watch TV，turn on lights，dry hair，play video games，wash or dry our clothes or drive cars．The rubbish（waste） from factories and homes also produces greenhouse gases．

Even a small change in temperature can affect （ 影響） our weather．This can cause changes in the sea levels，the air，flooding，and our fresh water．

The change in the temperature can also cause changes in the living places for animals and plants，endangering many animals．

Global warming（全球變暖） is a big problem，and every little bit we do can help．We can save electricity．We can save energy in other ways such as by taking buses or walking rather than driving cars．We can recycle to reduce the rubbish and save natural resources such as trees，oil and metals．We can buy products that don't do bad to the environment and we can turn to solar energy．Remember the little bit that you do will bring a better world．

1．Which of the following does not send greenhouse gases into the air?

A．Turning on a light．                        B．Walking to school．

C．Driving a car．                           D．Watching TV．

2．In this passage，the scientists are mainly trying to make the readers realize___________

A．the earth could be getting warmer by itself   

B．the earth is getting warmer in 100 years

C．the greenhouse effect is important

D．humans are making the earth warmer

3．Without the greenhouse effect，we would_____________

A．not be able to live                        B．be safer

C．have a cleaner earth                      D．have a better world

4．The writer gives us advice on how to save energy in __________

A．Paragraph 2        B．Paragraph 3         C．Paragraph 4        D．Paragraph 5

5．Global warming is a big problem but ___________

A．we can't do anything to help                B．we don't need to do anything

C．we can do something to help               D．we can do something to stop it

The world is not hungry，but it’s thirsty.   1  while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes.   2  ，because some of it has been polluted.
　　Now more water is needed.The problem is how we can avoid a serious water shortage in the future.  3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .
　　The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world.   6 So you see，if we can find out a way，we’ll be in no danger of drying up.
從方框中所給的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)，補(bǔ)全短文。其中有一項(xiàng)為多余選項(xiàng)。

The world is not hungry，but it’s thirsty.   1  while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes.   2  ，because some of it has been polluted.

　　Now more water is needed.The problem is how we can avoid a serious water shortage in the future.  3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .

　　The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world.   6 So you see，if we can find out a way，we’ll be in no danger of drying up.

從方框中所給的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)，補(bǔ)全短文。其中有一項(xiàng)為多余選項(xiàng)。

E. First, we should find out ways to reuse it.

F. And we can’t even use all of that.