【正确答案】 B

【答案解析】[听力原文] 33-35
According to a weather expert's prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities. At the same time, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of earth's chief food-growing zones.
In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.
Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.
However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. As a result, scientists conclude that up to now natural influences on the weather have exceeded those caused by human being.
[解析] 文章开头提到根据气象专家的预测，假如人类继续以目前的速率燃烧燃料的话，到2050年大气要比现在高3℃。因此选B。
[点睛] C、D两项极具干扰性，但这些是气温上升造成的结果而非原因。因果关系处常设考题，听音时要加以注意。

【正确答案】 B

【答案解析】[解析] 文中谈到，在过去气象专家更多地关注北极而现在却更多地关注南极西部地区。因此正确答案是B。
[点睛] 浏览选项可预测本题考查与事件有关的地点问题，A、C两项文中都有提及，尤其是A项很具有干扰性，但只要听到but转折后面的内容就能选对。语义转折处往往会出题。

【正确答案】 C

【答案解析】[解析] 短文结尾提到，科学家们得出结论: 到目前为止，自然界对天气的影响超过人类对天气的影响。因此正确答案为C。
[点睛] 四个选项都是把nature和human beings对某方面影响的大小进行比较，听音时只要抓住“影响大小”这一点就可以了。C中的more influence是原文exceed的近义替换。