四六级考试

【单选题】In the atmosphere, carbon dioxide acts rather like a one way mirror or the glass in the roof of a greenhouse which allows the sun’’s rays to enter but prevents the heat from escaping.According to a weather expert’’s prediction, the atmosphere will be 3°C、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 metres and severely flooding coastal cities.Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the earth’’s chief food growing zones. In the past, concern about a man-made warming of the earth has concentrated on theArctic because theAntarctic is much colder and has a much thicker ice sheet.But the weather experts are now paying more attention to WestAntarctic, 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 ofAntarctic 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. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect On the weatherOne possibility is the variable behavior of the sun.Astronomers at one research station have studied the hot spots and cold spots (that is, the relatively less hot spots),on the sun.As the sun rotates, every 27.5 days, it presents hotter or colder faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth’’s atmospheric pressure, and consequently on wind circulation. The sun is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downwar
D、 Scientists are now finding mutual relations between models of solar weather interactions and the actual climate over many thousands of years, including the last IceAge. The problem is that the models are predicting that the world should be entering a new IceAge and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth’’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful counter balance to the sun’’s diminishing heat. The article was written to explain______.
A、the greenhouse effect

B、the solar effects on the earth
C．the models of solar weather interactions

D、the causes affecting weather

网考网参考答案：D
网考网解析：
主旨大意题。文章提到了温室效应，接着指出自然对气候的影响大于人类的活动，通过综合归纳，影响气候的原因包括人为和自然因素，[C]项概括得比较全面。[A]和[B]都是文章内容的一部分。[C]项内容在文中并未有过多阐述。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>