The sentence given to the criminal was much too （ ） ; murder should carry the maximum penalty.

A.negligent B.solitary C.lenient D.tedious

Our parents love us because we are their children, and this is an （ ） fact，so that we feel safer with them than with anyone else.

A.unambiguous B.uncontrollable C.unalterable D.unintentional

s="" theseo="" campaign="" and="" the="" nasa-sponsored="" solve="" campaign.="" Researchers will examine the processes that control ozone amounts during the Arctic winter at mid to high latitudes. It was a failure to properly understand some of the chemistry over the South Pole that led to inaccurate forecasts about ozone depletion in the Southern Hemisphere.Scientists want to make sure the computer models they use to project future depletion over the North are better able to handle the complex processes at work.（5） Some recent research has suggested that global warming, should it happen, could accelerate ozone thinning.'>

An international team of scientists has been gathered together to undertake the biggest study yet of ozone levels over the Arctic. Researchers from the EU, Canada, Iceland, Japan, Norway, Poland, Russia, Switzerland and the US will examine the processes that control ozone amounts during the Arctic winter more than 20 kilometres above the Earth. （1）Ozone is a molecule in which three oxygen atoms are joined together. It is constantly being made and destroyed in the stratosphere. It plays a crucial role in protecting life below by filtering out harmful ultraviolet radiation (less than 290 nanometres) coming from the Sun. （2）It has been known for some time that man-made chlorine and bromine compounds can upset the balance of chemistry at high altitudes leading to a thinning of ozone. The chlorine compounds have been produced for use as refrigerants, aerosol sprays, solvents and foam blowing agents, while bromine-containing halons have been used in fire extinguishers. （3）Nevertheless, very low levels of ozone have been observed over the Arctic in several winters during the 1990s, raising concerns that an ozone "hole" might form like the one detected over the South Pole. （4）The new study, which will look at ozone levels from November 1999 through to March 2000, is a collaborative effort involving scientists working on Europe's Theseo campaign and the Nasa-sponsored Solve campaign. Researchers will examine the processes that control ozone amounts during the Arctic winter at mid to high latitudes. It was a failure to properly understand some of the chemistry over the South Pole that led to inaccurate forecasts about ozone depletion in the Southern Hemisphere.Scientists want to make sure the computer models they use to project future depletion over the North are better able to handle the complex processes at work. （5） Some recent research has suggested that global warming, should it happen, could accelerate ozone thinning.

A.A northern hole is potentially more dangerous because it would affect areas with higher populations. B.This radiation can damage DNA, thereby leading lo the formation of skin cancers. C.The scientists particularly want to know what impact any human-induced warming of the atmosphere might have on ozone levels. D.Recovery of the ozone layer, however, is expected to take 50 to 100 years. E.This project to measure the ozone, and other atmospheric gases, will use satellites planes, heavy-lift and small balloons，and ground-based instruments. F.World governments have now moved to restrict their use.
问题2：
A.A northern hole is potentially more dangerous because it would affect areas with higher populations. B.This radiation can damage DNA, thereby leading lo the formation of skin cancers. C.The scientists particularly want to know what impact any human-induced warming of the atmosphere might have on ozone levels. D.Recovery of the ozone layer, however, is expected to take 50 to 100 years. E.This project to measure the ozone, and other atmospheric gases, will use satellites planes, heavy-lift and small balloons，and ground-based instruments. F.World governments have now moved to restrict their use.
问题3：
A.A northern hole is potentially more dangerous because it would affect areas with higher populations. B.This radiation can damage DNA, thereby leading lo the formation of skin cancers. C.The scientists particularly want to know what impact any human-induced warming of the atmo

The only way he escaped from the bitter reality was to lose himself in a movie，allowing his imagination to（ ），viewing himself as a character in it.

A.take up B.take on C.take off D.take over

Schools and colleges have no right to use our public money to promote conduct that is （ ）to the religious and moral values of parents and taxpayers.

A.conducive B.comparable C.pointing D.offensive

Our trouble lies in a simple confusion，one to which economists have been prone since the beginning of the Industrial Revolution. Growth and ecology operate by different rules. Economists tend to assume that every problem of scarcity can be solved by substitution, by replacing tuna with tilapia，without factoring in the long-term environmental implications of either. But whereas economies might expand，ecosystems do not. They change—pine gives way to oak，coyotes arrive in New England—and they reproduce themselves, but they do not increase in extent or abundance year after year. Most economists think of scarcity as a labor problem，imagining that only energy and technology place limits on production. To harvest more wood，build a better chain saw; to pump more oil，drill more wells； to get more food，invent pest-resistant plants.That logic thrived on new frontiers and more intensive production，and it held off the prophets of scarcity—from Thomas Robert Malthus to Paul Ehrlich—whose predictions of famine and shortage have not come to pass. The Agricultural Revolution that began in seventeenth-century England radically increased the amount of food that could be grown on an acre of land，and the same happened in the 1960s and 1970s when fertilizer and hybridized seeds arrived in India and Mexico. But the picture looks entirely different when we change the scale. Industrial society is roughly 250 years old： make the last ten thousand years equal to twenty-four hours，and we have been producing consumer goods and C()2 for only the last thirty-six minutes. Do the same for the past 1 million years of human evolution， and every thing from the steam engine to the search engine fits into the past twenty-one seconds. If we are not careful，hunting and gathering will look like a far more successful strategy of survival than economic growth. The latter has changed so much about the earth and human societies in so little time that it makes more sense to be cautious than triumphant.Although food scarcity，when it occurs，is a localized problem，other kinds of scarcity are already here. Groundwater is alarmingly low in regions all over the world，but the most immediate threat to growth is surely petroleum.1.Economists are prone to（ ）.2.What does the author think of ecosystems?3.What does the passage say about the predictions made by Thomas Robert Malthus and Paul Ehrlich?4.What happened in the 1960s and 1970s?5.The purpose of mentioning the search engine is to show （ ） .6.The last sentence of the second paragraph implies that（ ） .

A.emphasize the differences between economic growth and scarcity B.ignore the human creative and productive power C.see ecology from an economic perspective D.use different approaches to economy and ecology
问题2：
A.They may deteriorate. B.They may benefit from economy. C.They are associated with productivity. D.They are closely related to technology.
问题3：
A.They proved to be useful. B.They have not come true. C.They proved to be accurate. D.They have not drawn enough attention.
问题4：
A.Food production increased in India. B.Fertilizer began to be used in England. C.Hybridized plants were grown in the US. D.Land expansion occurred in Mexico.
问题5：
A.the economic impact of information technology B.the high speed of modern machines C.popular interest in the Internet D.technological progress
问题6：
A.economic growth has reduced the biodiversity worldwide B.economic growth has changed the ecosystem rapidly C.people should be proud of their position in nature D.people and nature should coexist in harmony