阅读下列短文，从所给的四个选项中，选出最佳答案

　Scientists would like to place a huge mirror in space above the earth. It might be sixty miles wide. It would be used to catch the rays （光线） of the sun. It would direct the sun's rays upon the earth as a child might do to make sunlight dance on the wall with a hand mirror.

　Why do they want to do this? The sun's rays could be helpful in many ways. They could light cities by night. The warm rays could stop frosts （霜冻）which might come at night and hurt （伤害）fruit crops. They could melt （融化）dangerous icebergs （冰山）in the ocean. Perhaps they could change cloud movements and bring rain where it is needed.

1．The huge mirror is ______.　　　

[　　]

A．to be made soon　　　　B．being made

C．something in a story　　　D．just an idea

2．From this passage we can see that scientists ______.　　　

[　　]

A．are hard-working

B．are working hard to find ways to make good use of the sunlight

C．like big mirrors

D．like something new

3．The huge mirror would ______.　　　

[　　]

A．be 60 miles above the earth

B．be 60 miles from side to side

C．cover 60 miles above the earth

D．stand 60 miles in height

4．The mirror would be used to ______.　　　

[　　]

A．see how clouds move

B．reflect （反射）sunlight

C．see what the earth looks like

D．absorb （吸收）sunlight

5．The strong light from the mirror could possibly ______.　　　

[　　]

A．hurt fruit crops

B．set fire to cities

C．shine through walls

D．bring longer daytime

For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants（污染物）can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb（吸收）or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.

56. Generally speaking, indoor air pollution may be more harmful than the air outside because ______.

A．indoor air pollution can often make people seriously ill

B．man-made building materials give off dangerous gases

C．there may be more harmful gases outside the buildings

D．the air indoors is polluted, which is very harmful

57. Some kind of indoor pollution can be found in _______.

A．every modern house                                   B．every old house

C．all kinds of houses                                      D．all kinds of offices

58. The indoor air pollution is caused by ______.

A．the limit of the flow of air between inside and outside

B．the building way that the builders want to save energy

C．the building things that are made of man-made materials

D．the man-made building materials and the limit of air-flow

59. The reason why we should use different kinds of plants to clean the air is that ______.

A．plants can let out all kinds of pollutants indoors

B．plants may take in more oxygen （氧气）which people need

C．plants can absorb all kinds of harmful indoor chemicals

D．plants can make our houses prettier.

For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants（污染物）can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building—green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb（吸收）or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.

56. Generally speaking, indoor air pollution may be more harmful than the air outside because ______.

A．indoor air pollution can often make people seriously ill

B．man-made building materials give off dangerous gases

C．there may be more harmful gases outside the buildings

D．the air indoors is polluted, which is very harmful

57. Some kind of indoor pollution can be found in _______.

A．every modern house                                   B．every old house

C．all kinds of houses                                      D．all kinds of offices

58. The indoor air pollution is caused by ______.

A．the limit of the flow of air between inside and outside

B．the building way that the builders want to save energy

C．the building things that are made of man-made materials

D．the man-made building materials and the limit of air-flow

59. The reason why we should use different kinds of plants to clean the air is that ______.

A．plants can let out all kinds of pollutants indoors

B．plants may take in more oxygen （氧气）which people need

C．plants can absorb all kinds of harmful indoor chemicals

D．plants can make our houses prettier.

Bungee jumping is an activity about jumping from a tall structure while connected to a large elastic cord(有弹性的绳子). The tall structure is usually a fixed object, such as a building, bridge or crane; but it is also possible to jump from a movable object, such as a hot-air balloon or helicopter, that has the ability to stay over one place on the ground; fixed-wing aircraft are unsuitable because they only stay high when moving quickly forward.
When the person jumps, the cord stretches to absorb (吸收)the energy of the fall, then the jumper flies upwards again as the cord jumps back. The jumper oscillates(摆动)up and down until all the energy is used up.
The word bungee first appeared around 1930 and was the name for a rubber eraser. The first modern bungee jumps were made on 1 April 1979 from the 250-foot Clifton Suspension Bridge in Bristol, by David Kirk, Chris Baker and Alan Weston of the Dangerous Sports Club. The jumpers continued with jumps in the US from the Golden Gate and Royal Gorge bridges, spreading the concept worldwide. By 1982 they were jumping from mobile cranes and hot-air balloons. Later they put on commercial(商业的)shows, which began in 1986.
As with any sport, injuries can still happen, and there have been deaths. A relatively common mistake in the cases that may cause death is to use a cord that is too long. The cord should be fully shorter than the height of the jumping place to allow it room to jumper either starts to slow down or keeps speeding up depending upon the speed of falling.
【小题1】Which of the following is NOT suitable for bungee jumping?

A．The fixed-wing aircraft	B．The helicopter
C．The hot-air balloon	D．The mobile crane

【小题2】In the second paragraph, the author tells_________________.

A．who suits bungee jumping

B．the principle of bungee jumping

C．the material used for bungee jumping

D．the danger of bungee jumping

【小题3】According to the last paragraph, the safety of the jumpers depends mainly on________.

A．the weight of the jumper

B．the height of the jumping place

C．the length of the cord

D．the speed of the falling

【小题4】The purpose of writing this passage is to__________.

A．teach people how to carry out a bungee jumping

B．remind people of the danger of bungee jumping

C．advise people not to take the risk of bungee jumping

D．introduce some knowledge about bungee jumping

School education is very important and useful. Yet no one can learn everything from school. A teacher, no matter how much he knows, he can not teach his students everything they want to know. The teacher’s job is to show his students how to learn. He teaches them how to read and how to think. So much more is to be learned outside school by the students themselves.
It is always more important to know how to study by oneself than to learn some facts or a formula by heart. It is actually quite easy to learn a certain fact in history or a formula(公式) in mathematics. But it is very difficult to use a formula in working out a maths problem. Great scientist, such as Einstein, Newton and Galileo, didn’t get everything from school. But they were all so successful and invented so many things for men. They worked hard all their lives, wasting not a single moment. They would ask many questions as they read and they did thousands of experiments.
【小题1】According to the passage, a good teacher should be one who is to_________.

A．help his students to gain a good memory.

B．train his students’ ability to learn

C．teach his students everything he knows

D．have his students studying long hours

【小题2】 If a student want to learn better, the most important thing for him to do is_______.

A．to learn all the useful facts and formula by heart

B．to do everything as his teacher have said in class

C．to absorb (吸收) as much knowledge from his teacher as possible

D．to think more while he is studying

【小题3】The main reason for the success of the great scientists is that________.

A．the teachers who had taught them were all experienced.

B．they used to work and study without a moment’s rest.

C．they had received more schooling than other people

D．they know how to study and worked hard

【小题4】What’s the good advice the writer gives us?

A．We can learn better without teachers

B．We should do more asking and thinking while studying

C．We should pay enough attention to classroom

D．Book knowledge is little use