[简答题]

It sometimes seems that plans for emissions trading are piling up even faster than the greenhouse gases they are designed to curb. In late July the first emission exchange in Australia and Canada opened, in anticipation of mandatory carbon-trading schemes in both countries. America already has a healthy voluntary carbon market, and will soon add an obligatory one for utilities in certain states. But the evidence from the most advanced such "cap-and-trade" programme, the European Union’s Emissions Trading Scheme (ETS), suggests that companies are struggling to make the most of carbon markets.
In theory, cap-and-trade schemes allow firms to reduce their emissions at the lowest possible cost. Governments put a limit on the amount firms can pollute, and issue an equivalent number of allowances. Those companies that find they do not have enough must either cut emissions or buy spare allowances from others. But for the system to work efficiently, fir

[简答题]When foreigners are sometimes asked what seems most strange about American society, somewhere on the top of the list will be the fact the average citizen is allowed to possess guns.
Although it is true that many people carry guns legally in the United States, it is also known that many who possess guns carry illegally. Others, who don’t have guns, feel that guns can be acquired quite easily. A recent survey indicated that many high school students, especially in the inner cities, can acquire gun with little difficulty.
Although most people would never want to own a gun, others have taken up hunting as a sport and enjoy hunting wild game in season. Hunting for deer and duck in fall and winter is very much a part of the American culture.
Also, some farmers in rural areas who raise cattle and sheep feel they need to protect their animals against wolves that attack their herds and flocks at night. To defend and support their fights to possess firearms the National Rifl

[单项选择]
Sometimes it seems like we’re all friends on Facebook. But the sad truth is that Americans are lonelier than ever. Between 1985 and 2004, the number of people who said they felt lonely tripled, to 25 percent, according to Duke University researchers.
Social isolation in all adults has been linked to sleep disorders, high blood pressure, and an increased risk of depression and suicide, says John T. Cacioppo, a neuroscientist at the University of Chicago.
Though more Americans than ever are living alone, the connection between single -living and loneliness is in fact quite weak. "Some of the most profound loneliness can happen when other people are present," says Harry Reis, professor of psychology at the University of Rochester. Take college freshmen: even though they’re surrounded by people almost all the time, many feel incredibly isolated during the first quarter of the school year, Cacioppo says. By the second q
A. Because in 2004 ,there are an increase of 25% in the number of people who feel lonly.
B. Because in 2004,the number of people feel lonely is 3 times as many as that in 1985.
C. Because we can not make friends through Facebook.
D. Because more and more Americans living alon

[单项选择]Passage Two