Many scientists say that the world is getting hotter and hotter．If they are right , the ice at the North and South Pole will melt eventually．If this happens, the sea will  1  and may cover most  2  all of Singapore．This will force everybody to move to a  3  country．

       We know that the sun  4  the earth．The heat from the sun hits the  5  , and some of 6  goes back into the sky．However, factories and cars  7  a lot of carbon dioxide（二氧化碳）．When the gas rises into the sky, the heat from the sun can come  8  them but the heat from the ground cannot．It  9  near us in the sky and makes the  10  hotter and hotter every year．

Scientists call this the “greenhouse effect” because a greenhouse is a small glass  11  which is hot inside．It is used for  12  plants in cool countries．Many countries are  13  about the greenhouse effect．They are trying to stop factories and cars from sending  14  gases into the sky．Scientists are not sure when the world will get much hotter．Some people say that the greenhouse effect has  15  already and has begun to affect the world’s weather．

1．A．rise                          B．fall                         C．change                   D．disappear

2．A．and                          B．or                           C．but                         D．till

3．A．better                       B．larger                      C．safer                      D．farther

4．A．shines                   B．circles                    C．covers                    D．heats

5．A．ground                     B．sky                         C．mountain                D．forest

6．A．them                        B．it                            C．those                      D．such

7．A．make                        B．spread                    C．produce                  D．from

8．A．through                    B．over                       C．into                        D．toward

8．A．hides                        B．continues                C．follows                   D．stays

10．A．cloud                      B．air                          C．season                    D．temperature

11．A．building                   B．flat                         C．tool                        D．machine

12．A．putting                    B．storing                    C．cutting                    D．growing

13．A．excited                   B．disappointed            C．worried                  D．pleased

14．A．dangerous               B．harmful                   C．heavy                     D．useful

15．A．meant                     B．improved                C．started                    D．stopped

For many years scientists have said that the earth is getting warmer. Now they have found something new-hot cities! In the southern US, they have found that cities become very hot in summer. For example, the city of Atlanta in Georgia has roof(屋顶) temperature of up to 50^oC while it is 27℃ in the streets! At night, the outside of buildings stays so hot that the heat of the city causes storms over the city!

China also has the same kind of problems. Every year more farmland is used for factories or offices. More housing is needed, too. As people become richer, they buy more cars. New roads are needed and new car parks are built in the city centers. This all makes cities hotter.

It isn’t easy to change the situation. City planners say that we should plant more trees in the middle of cities. Every new street should have trees on both sides, they say. Trees make the temperature lower, so we should have more trees in our parks and squares. We should also paint our roofs white. If we do this, they do not become so hot. Every roof in a hot and sunny country should have solar(太阳的) roof panels. The electricity from these can be used to run the air conditioners (空调)in the buildings.

People continue to cut down forests around the cities. This makes the problem worse. Cities are growing faster and faster. By the year 2025, four fifths(五分之四) of the population will be living in cities. If we go on like this, there will not be enough farmland to feed everyone in the world

1.The scientists have found       .

2.The way to make the city cooler is to       .

3.What will probably happen in the future according to the fourth paragraph(段落)?

4.What is the best title(题目)for the passage?

For many years scientists have said that the earth is getting warmer. Now they have found something new-hot cities! In the southern US, they have found that cities become very hot in summer. For example, the city of Atlanta in Georgia has roof(屋顶) temperature of up to 50^oC while it is 27℃ in the streets! At night, the outside of buildings stays so hot that the heat of the city causes storms over the city!
China also has the same kind of problems. Every year more farmland is used for factories or offices. More housing is needed, too. As people become richer, they buy more cars. New roads are needed and new car parks are built in the city centers. This all makes cities hotter.
It isn’t easy to change the situation. City planners say that we should plant more trees in the middle of cities. Every new street should have trees on both sides, they say. Trees make the temperature lower, so we should have more trees in our parks and squares. We should also paint our roofs white. If we do this, they do not become so hot. Every roof in a hot and sunny country should have solar(太阳的) roof panels. The electricity from these can be used to run the air conditioners (空调)in the buildings.
People continue to cut down forests around the cities. This makes the problem worse. Cities are growing faster and faster. By the year 2025, four fifths(五分之四) of the population will be living in cities. If we go on like this, there will not be enough farmland to feed everyone in the world
【小题1】The scientists have found       .