Intheatmosphere，carbondioxideactsratherlikeaone-waym...

問題詳情：

    In the atmosphere， carbon dioxide acts rather like a one-way mirror 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 wilbe3C warmer in the year 2050thanitis today， if man continues to burn fuels at the present this warming up took place， the icecaps in the poles would begin to melt thus raising sea level several meters and severely flooding coastal ， the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere(半球) ， 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 the Arctic because the Antarctic is much colder and has a much thicker ice the weather experts are now paying more attention to West Antarctic， which maybe 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 evidence available suggests that a warming has taken 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 question is：Which natural cause has most effect on the weather?

One possibility is the variable behavior of the onomers at one research station have studied the hot spots and“cold”spots(that is， the relatively less hot spots) on the the sun rotates(旋轉) ， every 27.5 days it presents hotter or“colder”faces to the earth， and different aspects to different parts of the seems to have a considerable effect on the distribution of the earth's atmospheric pressure， and consequently on wind sun is also variable over along term：its heat output goes up and down in cycles， the latest trend being downward.

Scientists are now finding mutual relations between models of solar-weather interactions and the actual climate over many thousands of years， including the last Ice problem is that the models are predicting that the world should be entering a new Ice Age and it is way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia(慣*) of the earth's this is right，the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun's diminishing(減少) heat.

1．Why is the fuel consumption greater in then or them hemisphere， but temperatures there seem to be falling?

A．Mainly because the levels of carbon dioxide are rising.

B．Possibly because the output of solar energy varies.

C．Because the inertia of the earth's climate take effect.

D．Possibly because the icecaps in the poles are melting

2．On the basis of their models， scientists are of the opinion that

A．the climate of the world should be becoming cooler

B．the new Ice Age will be delayed by the greenhouse effect

C．the man-made warming effect helps to increase the solar effects

D．it will take thousands of years for the inertia of the earth's climate to take effect

3．If the assumption about the delay of a new Ice Age is correct，     .

A．the best way to overcome the cooling effect would be to burn more fuels

B．ice would soon cover the northern hemisphere

C．the increased levels of carbon dioxide would warm up the earth quickly

D．the greenhouse effect could work to the advantage of the earth

4．The purpose of the article is 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

【回答】

1．B

2．A

3．D

4．D

【分析】

本文是一篇說明文。文章主要分析了全球暖化的真正原因。

1．細節理解題。根據第五段的Scientists conclude，therefore，that up to now natural influences on the weather have exceeded those caused by man.（因此，科學家得出結論，到目前為止，自然對天氣的影響已經超過了人為的影響）可知，自然對天氣的影響超過了人類對天氣的影響；再根據第六段的One possibility is the variable behavior of the sun.（一種可能*是太陽的變化行為），表明一種自然因素的可能*是太陽的可變行為，即太陽能量釋放的不同。綜上可知北半球的燃料消耗更大，但那裡的溫度似乎在下降的原因是太陽能的輸出是變化的。故選B。

2．推理判斷題。定位到最後一段第二句The problem is that the models are predicting that the world should be entering a new Ice Age and it is not（問題是，這些模型預測世界將進入一個新的*河世紀，而事實並非如此）可以推測科學家認為地球氣候應變冷，而進入新的*河時期。也就是說根據他們的模型，科學家們認為世界的氣候應該變得更冷，故選A。

3．推理判斷題。定位到最後一段最後一句If this is right，the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun's diminishing(減少) heat.（如果這是正確的，那麼二氧化碳的變暖效應可能會對太陽熱量的減少起到有效的平衡作用）可知，如果新的*河時期推遲的假設正確，那麼二氧化碳的變暖效應可能會作為一種有用的平衡來對抗太陽的熱量衰減，也就是溫室效應會對地球有利，故選D。

4．推理判斷題。通讀全文以及第五段的Which natural cause has most effect on the weather?（哪一種自然因素對天氣影響最大?）這句關鍵句可知，本文介紹了二氧化碳對全球氣候的影響和太陽能量的輸出活動對氣候的影響，分析全球暖化的真正原因，故全文的寫作主旨一直在探討全球暖化的原因， 故選D。

知識點：閱讀理解 單元測試

題型：閱讀理解