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单选集
Humans have altered the world’s climate by (1) heat-trapping gases since almost the beginning of civilization and even prevented the start of an ice age several thousand years ago, a scientist said.
Most scientists (2) a rise (3) global temperatures over the past century (4) to emissions of carbon dioxide (5) human activities like driving cars and operating factories.
Dr. William Ruddiman, a professor at the University of Virginia, said at a meeting of the American Geophysical Union (6) humans’ effect (7) climate went back nearly 10, 000 years (8) people gave up hunting and gathering and began farming.
In a commentary accompanying the article, Dr. Thomas J. Crowley of Duke University, said he (9) Dr. Ruddiman’s premise at first. "But when I started reading, Dr. Crowley wrote, "I could not help but (10) whether he just might be (11) something."
The climate of the last 10,000 years has been unusually stable, (12) civilization to flourish. But that is only because people chopped down swaths of forest in Europe, China and India for croplands and pastures. Carbon dioxide (13) by the destruction of the forests, plus methane, another heat-trapping gas, (14) by irrigated rice fields in Southeast Asia, trapped enough heat to (15) an expected natural cooling.
Levels of carbon dioxide and methane rise and fall in natural cycles (16) thousands of years, and both reached a peak at the end of the last ice age 11 ;000 years ago. Both then declined (17) expected.
Both (18) declining through the present day, leading to lower temperatures, and a new ice age should have begun 4,000 to 5,000 years ago, Dr. Ruddiman said. Instead, levels of carbon dioxide reversed 8,000 wears ago. The decline (19) methane levels reversed 5,000 years ago, (20) with the advent of irrigation rice farming.
A:released B:was released C:has been released D:had been released
Humans have altered the world’s climate by (1) heat-trapping gases since almost the beginning of civilization and even prevented the start of an ice age several thousand years ago, a scientist said.
Most scientists (2) a rise (3) global temperatures over the past century (4) to emissions of carbon dioxide (5) human activities like driving cars and operating factories.
Dr. William Ruddiman, a professor at the University of Virginia, said at a meeting of the American Geophysical Union (6) humans’ effect (7) climate went back nearly 10, 000 years (8) people gave up hunting and gathering and began farming.
In a commentary accompanying the article, Dr. Thomas J. Crowley of Duke University, said he (9) Dr. Ruddiman’s premise at first. "But when I started reading, Dr. Crowley wrote, "I could not help but (10) whether he just might be (11) something."
The climate of the last 10,000 years has been unusually stable, (12) civilization to flourish. But that is only because people chopped down swaths of forest in Europe, China and India for croplands and pastures. Carbon dioxide (13) by the destruction of the forests, plus methane, another heat-trapping gas, (14) by irrigated rice fields in Southeast Asia, trapped enough heat to (15) an expected natural cooling.
Levels of carbon dioxide and methane rise and fall in natural cycles (16) thousands of years, and both reached a peak at the end of the last ice age 11 ;000 years ago. Both then declined (17) expected.
Both (18) declining through the present day, leading to lower temperatures, and a new ice age should have begun 4,000 to 5,000 years ago, Dr. Ruddiman said. Instead, levels of carbon dioxide reversed 8,000 wears ago. The decline (19) methane levels reversed 5,000 years ago, (20) with the advent of irrigation rice farming.
A:released B:was released C:has been released D:had been released
The Scottish countryside will soon be home to creatures which is strange to Britain. This spring, 17 beavers (海狸) will be released into a remote area of rivers and forests. Hunted to extinction throughout Europe, beavers haven’t roamed Britain’s wilderness for almost 500 years. Ecologists would like to invite back other long-lost species to help restore the natural balance. To save the country’s plants from deer, which have doubled to 2 million since the start of this decade, an Oxford University biologist late last year called for reintroducing the lynx (猞猁)—a wildcat that died out in Britain 1,300 years ago.
Nature has long been a popular cause in Europe. British people love their countryside of fences and fields, the French their vineyards (葡萄园) and the Germans their hiking forests. But in recent years conservationists have set their sights on the more distant past, when Europe’s forests and meadows were full of elephants, hippo-potamuses (河马), rhinoceroses(犀牛) and big cats. Some ambitious conservationists are now advocating a return to norms of wilderness that date back to 11,000 years ago when the biggest mammals were at the top of the food chain.
Nobody is advocating allowing elephants and lions to run crazily in this densely populated region. But wilding supporters would give free control to a long list of lesser mammals, including the beaver and the lynx, which some people fear could be destructive. Some landowners withdraw at the thought of beavers cutting down trees with their teeth and flooding their property; the Scottish Parliament rejected several earlier efforts to reintroduce the mammal. Proposals to set loose wolves and bears in Britain have also encountered resistance.
Although rhinos and hippos thrived in Europe thousands of years ago, no one is sure what effect they would have on ecosystems now. "The idea of bringing back big mammals is interesting, but when you get down to the nuts and bolts, there’s a lot of questions," say some biologists. For example, elephants could destroy what little forest and grassland Europe has left.
The beavers of Tierra del Fuego provide a cautionary tale. When a failed commercial fur farm released its few remaining beavers into the wild 60 years ago, the population exploded, and they are still revenging the local people. Is this Britain’s future Supporters say no, the beaver will fit right in. Destroying nature is not a job for the mild.
The word "roamed" (Line 3, Para. 1) most probably means ______.
A:strolled B:released C:cultivated D:exploded
Passage Five
Billy Joel was born on Long Island, in New York State. He began taking piano lessons at an early age and joined his first rock band when he was fourteen. After playing in a number of Long Island groups, Billy began concentrating on his song-writing. His first album of completely original songs was Cold Spring Harbor. It was released in 1972. Two years later, after the release of the smash-hit albums Piano Man and Street-life Serenade. Billy was named "Best New Male Vocalist" by Cask Box magazine.
A:written when Billy Joel was fourteen B:released by Columb a Records C:hit albums D:written as movies soundtracks
Passage Five
Billy Joel was born on Long Island, in New York State. He began taking piano lessons at an early age and joined his first rock band when he was fourteen. After playing in a number of Long Island groups, Billy began concentrating on his song-writing. His first album of completely original songs was Cold Spring Harbor. It was released in 1972. Two years later, after the release of the smash-hit albums Piano Man and Street-life Serenade. Billy was named "Best New Male Vocalist" by Cask Box magazine.
A:Piano Man was released. B:Billy Joel played in a number of Long Island groups. C:Cold Spring Harbor was released. D:Billy Joel was named "Best New Male Vocalist".
Passage Five Billy Joel was born on Long Island, in New York State. He began taking piano lessons at an early age and joined his first rock band when he was fourteen. After playing in a number of Long Island groups, Billy began concentrating on his song-writing. His first album of completely original songs was Cold Spring Harbor. It was released in 1972. Two years later, after the release of the smash-hit albums Piano Man and Street-life Serenade. Billy was named "Best New Male Vocalist" by Cask Box magazine.
According to the article, Piano Man and Street-life Serenade were（）A:written when Billy Joel was fourteen B:released by Columb a Records C:hit albums D:written as movies soundtracks
Passage Five Billy Joel was born on Long Island, in New York State. He began taking piano lessons at an early age and joined his first rock band when he was fourteen. After playing in a number of Long Island groups, Billy began concentrating on his song-writing. His first album of completely original songs was Cold Spring Harbor. It was released in 1972. Two years later, after the release of the smash-hit albums Piano Man and Street-life Serenade. Billy was named "Best New Male Vocalist" by Cask Box magazine.
Which of the following facts is the last（）A:Piano Man was released. B:Billy Joel played in a number of Long Island groups. C:Cold Spring Harbor was released. D:Billy Joel was named "Best New Male Vocalist".
A:It has no competitor in the free software market. B:Downloading it would require register with the software firm. C:It can run on Windows 7 released in late September. D:Automatically updates will be provided to users.
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