It is only during the last few years that man has generally realized that in the world of nature a balance exists between all forms of life. No living thing can exist by itself. It is part of a system in which all forms of life are joined together. If we change one part of the nature order, this will almost certainly bring about changes in some other parts.
　　The cutting of forests reduced the supply of oxygen. The killing of weeds and insects by chemicals led to the wide-spread poisoning of animals and birds. The throwing of waste products into the ocean hurt life in the sea, while waste gases changed the chemical balance of the atmosphere and shut out some of the sun’s necessary life-giving rays.
　　And so we could go on adding more examples until in despair(绝望) we might feel like giving up the struggle to control these harmful human activities. Man is very clever at changing the world around him to satisfy his immediate needs, but he is not so clever at looking far ahead, or at thinking about what the future results of his action might be. Man may well destroy himself because of his silly action.
【小题1】The first paragraph tells us that _____.

What would you think if someone suggested knocking down St Paul’s Cathedral to widen the road? Or pulling down Big Ben to make way for a car park? It would be ridiculous, right? But when it comes to devastation (毁灭) of the natural world, we aren’t so easily shocked. But we should be…or we’ll be in a lot of trouble.

Nature is shrinking by the day. Ancient forests are destroyed. Wetlands are becoming dry. Woodland is disappearing, and all in the name of progress. This is bad in itself, but it’s devastating for biodiversity.

Biodiversity refers to the variety of plants, animals and other living things that are all interconnected. The ecological services provided by biodiversity are vital to everyday life. The air we breathe is a product of photosynthesis (光合作用) by green plants. Insects, worms and bacteria break down waste and make soils rich. And tiny organisms clean the water in rivers and sea. In fact, all life on the earth exists thanks to the benefits of biodiversity. More than 90 percent of the calories consumed by people worldwide are produced from 80 plant species. And 30 percent of medicines are developed from plants and animals. Maintaining a wide diversity of species in each ecosystem is necessary to preserve all living things.

The loss of biodiversity could be devastating. “It is wrong to think that biodiversity can be reduced indefinitely without threatening humans,” said Harvard University biologist Edward O. Wilson, known as the “father of biodiversity”. He warned, “We are about to reach a critical point beyond which biodiversity loss will become irreversible (不可挽回的).”

But what can we do? The present problem is that the concept of biodiversity is so vague (含糊的). People might care about giant pandas, but it is much harder to excite them about the fate of tiny sea creatures which are being boiled to death in the cooling systems of power stations along coastlines. The Guardian newspaper is trying to help. It has launched the Biodiversity 100 campaign to try to convince governments around the world to take action to deal with the widespread concerns about biodiversity. This includes persuading the UK government to create a series of marine reserves to reserve the decrease in the sea-life caused by industrial fishing, stopping fishing sharks by the Japanese fishermen and banning the killing of dingoes (wild dogs) in Australia, among many other things.

There is a lot to do. And we’d better act quickly if we don’t want to end up with a planet that can’t sustain life!

1.The writer thinks it ________ to pull down Big Ben to make way for a car park.

A．unreasonable      B．necessary         C．difficult           D．reasonable

2.The underlined sentence “Nature is shrinking by the day.” means that ________.

A．nature is badly polluted by humans

B．species are becoming fewer and fewer day by day

C．rainforests are being cut down every day

D．nature is full of mysteries

3.Edward O. Wilson thinks that ________.

A．it doesn’t matter to reduce biodiversity

B．people have done enough to preserve biodiversity

C．the situation of biodiversity is very serious

D．biodiversity loss has become irreversible

4.When it comes to biodiversity, the present problem is that ________.

A．people might not clearly know what is biodiversity and what should be protected

B．people are not aware that giant pandas are endangered

C．people don’t realize that biodiversity is vital to everyday life

D．people hunt sea creatures for food

5.What does the underlined word “It” in paragraph 5 refer to?

A．The UK government.                     B．The concept of biodiversity.

C．The action to deal with the problem.         D．The Guardian newspaper.

This is the SCIENCE IN THE NEWS, I’m Barbara Klein.

Animal experts say one of the world’s most beautiful and rare kinds of big cat is close to disappearing from the wild. A study earlier this year found that about thirty Amur leopards(豹) still live free. The cats are also called Far Eastern leopards.

Recently, their numbers have been reduced by one. Some person shot a female Amur, then beat her to death. The animal’s body was discovered last month in the Barsovy National Wildlife Refuge in eastern Russia.

An official of the World Wildlife Fund, Darron, said this was the third such killing in the area in the past fives years. Mr. Collins said the death of even one adult female is a huge loss for the endangered cat. He noted that the killing reduces the possibility for cubs(幼兽) or young.

It is not clear how many Amur leopards still live free. One population count was performed in February and March. Wildlife expert Dmitry Pikuuov led this study. It found evidence of seven to nine males. The study identified(确定) three to seven females without cubs. Four leopards were identified as females with cubs. In all, five or six cubs were recorded. Six to eight animals could not be identified.

Most of the land where the Amur leopard once lived was in China. New roads and climate change there threatened(威胁) the animals. So did hunters who kill big cats for their body parts.

Mr. Pikuuov says adult Amurs need about five hundred square kilometers with good forests to survive. He said they also need a large and continuing supply of animals like deer for food. He believes the answer to saving the Amur leopard is for governments to provide protected spaces for wildlife.

1.This passage is probably from____________.

A．a magazine        B．a newspaper report  C．a TV report        D．a film

2.Why is the killing of an adult female a huge loss?

A．It could lead to the death of an adult male.

B．It means it can not give birth to the young any more.

C．It is worth more money than a male.

D．There is only one adult female in the world.

3.The number of the Amur leopards in China is becoming smaller because of all the following EXCEPT

A．new roads         B．climate change     C．human hunting     D．rare diseases

4.According to the experts the Amur leopards ____________.

A．are living on plants                      B．are living in the zoo

C．are well protected by people              D．are endangered

The generous donation from China to the sufferers in the killing Indian Ocean Quake-tsunami has ____ the Chinese people’s unselfishness and internationalism.

  A. let out    B. brought out   C. given out    D. taken out

We do not know when man first began to use salt, but we do know that it has been used in many different ways throughout history. Historical evidence shows, for example, that people who lived over 3,000 years ago ate salted fish. Thousands of years ago in Egypt, salt was used to preserve (保存) the dead.
Stealing salt was considered a major crime (罪行) during some periods of history. In the eighteenth century, for example, if a person was caught stealing salt, he could be put in prison and his ears could be cut off.
In the Roman Empire, one of the most important roads was the one that carried salt from the salt mines to Rome. Guards were stationed along the route to protect against salt thieves, and they received their pay in salt, thus bringing the English word, salary. Any guard who fell asleep while on duty was thought to be “not worth his salt”, and as a result he would get a little less salt on his next payday. The expression, “not worth his salt”, is still used today in English.
In the modern world salt has many uses beyond the dining table. It is used in making glass and airplane parts, in the growing of crops, and in the killing of weeds (杂草). It is also used to make water soft, to melt (融化) ice on roads and highways, to make soap, and to fix colors in cloth.
Salt can be got in various ways besides being taken from mines underground. Salt water from the ocean, salt water lakes or small seas can be used to make salt. Yet, no matter where it comes from, salt will continue to play an important role in the lives of people everywhere.
【小题1】According to the text, salt can be used in the following EXCEPT _____.