14．What does the word“this”underlined in the third paragraph refer to?

　 A．We will lose much more than we can gain．

　 B．Humans have begun destroying rainforests．

　 C．People have a strong desire for resources．

　 D．Much carbon dioxide comes from burning rainforests．

13．Rainforests can help to adjust the climate because they 　　　．

　 A．reflect more heat into the atmosphere

　 B．bring about high rainfall throughout the world

　 C．rarely cause the temperature to drop lower than l6℃

　 D．reduce the effect of heat from the sun on the earth

12. From the last paragraph we can learn that __

　　 A. some pipes have to be re-arranged in winter

　　 B. the system can do more than warming up the building

C. the exchangers will pick up heat from the street surface

D.less heat may be collected in winter than in summer

　　　　　　　　　　　　　　　　　　　　 D

(NMET2009安徽)A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dropping below l6℃．Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate．Without the forest cover，these areas would reflect more heat into the atmosphere，warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns，potentially causing certain natural disasters all over the world．

　 In the past hundred years，humans have begun destroying rainforests in search of three major resources(资源)：land for crops，wood for paper and other products，land for raising farm animals．This action affects the environment as a whole．For example，a lot of carbon dioxide(二氧化碳)in the air comes from burning the rainforests．People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.

　 There are two main　 reasons for this．Firstly，when people cut down trees，generally they can only use the land for a year or two．Secondly，cutting large sections of rainforests may provide a good supply of wood right now，but in the long run it actually reduces the world’s wood supply．

　　 Rainforests are often called the world’s drug store．More than 25% of the medicines we use today come from plants in rainforests．However，fewer than l%of rainforest plants have been examined for their medical value．It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests．

11. For what purpose are the diving pipes used?

　　 A. To absorb heat from the sun.

B. To store heat for future use.

C. To turn solar energy into heat energy.

　　 D. To carry heat down below the surface.

10. Which of the following is true according to the first two paragraphs?

　　 A. Arian de Bondt got his idea from his boss.

　　 B. Large, flat, black surfaces need to be built in cities.

C. The Dutch engineer's system has been widely used.

D. Heat can also be collected from asphalt roads.

9. The text is most probably a ________.

A. science news report　　　　 B. book review　　

C. newspaper ad　　　　　 D. science fiction story

　　　　　　　　　　　　　　　　　　　 C

　(NMET2009安徽) Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are rub of black surfaces already, in the form of asphalt (柏油) roads?

　　 Ten years ago, this thought came into the mind of Arian de Bondt, a Dutch engineer. He finally persuaded his boss to follow it up. The result is that their building is now heated in winter and cooled in summer by a system that relies on the surface of the road outside.

　　　 The heat-collector is a system of connected water pipes. Most of them ran from one side of the street to the other, just under the asphalt road. Some, however, dive deep into the ground.

　　　 When the street surface gets hot in summer, water pumped through the pipes picks up this heat and takes it underground through one of the diving pipes. At a depth of 100 metres lies a natural aquifer (蓄水层) into which several heat exchangers (交换器) have been built. The hot water from the street runs through these exchangers, warning the ground-water, before returning to the surface through another pipe. The aquifer is thus used as a heat store.

　　　 In winter, the working system is changed slightly. Water is pumped through the heat exchangers to pick up the heat stored during summer. This water goes into the building and is used to warm the place up. After performing that task, it is pumped under the asphalt and its remaining heat keeps the road free of snow and ice.

8. According to Jae Kwon, his nuclear battery _______.

A. uses a solid semiconductor　　　　

B. will soon replace the present ones.

C. could be extremely thin　　　　　

D. has passed the final test.

7. Liquid semiconductor is used to _________.

A. get rid of the radioactive waste　

B. test the power of nuclear batteries.

C. decrease the size of nuclear batteries

D. reduce the damage to lattice structure.

6. Jae Kwon gave examples in Paragraph 4_________.

A. to show chemical batteries are widely applied.

B. to introduce nuclear batteries can be safely used.

C. to describe a nuclear-powered system.

D. to introduce various energy sources.

5. Which of the following is true of Jae Kwon?

A. He teaches chemistry at MU.　

B. He developed a chemical battery.

C. He is working on a nuclear energy source.

D. He made a breakthrough in computer engineering.