【正确答案】 C

【答案解析】[听力原文] In Romania, to the east, and Slovakia and the Czech Republic, to the north, populations in low-lying areas have been put on alert. In the Czech Republic, several people have died, and anti-flood barriers on the river Vltava have been raised. Czech officials have declared a state of emergency in several areas, and in the historic city of Olomouc, 250 kilometers east of Prague, thousands of people had to be evacuated.

【正确答案】 A

【答案解析】[听力原文] Falling ticket prices and rising incomes are leading to rapid growth in global air travel. According to the British government, the number of British air passengers, for example, will more than double in the next quarter of a century. Increases of such an order would mean much more aviation fuel being burned and aviation fuel may be more harmful to the environment than other fuels because the resulting smoke is emitted at high altitudes.

【正确答案】 A

【答案解析】[听力原文] Over timescales of thousands of years, the Earth goes through a natural cycle of warmer and colder periods, driven by changes in heat coming from the Sun. Professor William Ruddiman from the University of Virginia has now calculated that if the Earth had followed its natural cycle over the last ten thousand years, it ought to have got steadily colder.

【正确答案】 B

【答案解析】[听力原文] Writing in the respected American journal Nature, the scientists report on a 20-year environmental study in the Amazon basin. They say it shows changes which make the forests progressively less able to absorb the increasing amount of carbon dioxide discharged into the atmosphere by motor vehicles, factory emissions and other industrial processes around the world.

【正确答案】 C

【答案解析】[听力原文] Norway's oil production is vast, making the country the third largest oil exporter after Saudi Arabia and Russia. New areas for oil exploration are under constant consideration to keep production on a high level.