题目内容
阅读下面的短文，并根据短文后的要求答题（请注意问题后的字数要求）。
According to a weather expert’s prediction in 2006, 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 metres and severely flooding coastal cities.
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.
However, most of the fuel is burnt in the northern hemisphere（半球）, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded（胜过），those caused by man. The question is: Which natural cause has most effect on the weather?
One possibility is .Scientists at one research station have studied the hot spots and “cold” spots on the sun. As the sun rotates（旋转）, it presents hotter or “colder” faces to the earth, and different aspects to different parts of the earth. This appears 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 downward.
1．What is the best title of the passage?（within 10 words）
2．Please fill in the blank in the last paragraph with proper words or phrases to complete the sentence. （within 10 words）
3．Which sentence in the passage can be replaced by the following one?
So, experts believe that man’s behavior has less effect on the weather than that of the nature till now.
4．Is it significant for us whether the atmosphere will be warmer or colder? Why？
（within 30 words）
5．Translate the underlined sentence in the second paragraph into Chinese.
1．The Causes Affecting Weather/ What Cause Global Warming/ What Contributes to Global warming.
2．The changeable behavior of the sun./ the sun’s effect on the earth/ from the sun
3．Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man.
4．Yes. Because it will have a great effect on the environment on earth, which is very important for us.
5．因为南极较冷且冰层较厚，所以，在过去人们主要担心人为全球升温会影响北极。
（因为南极较冷且冰层较厚，所以，在过去人为的全球升温所带来的担忧主要集中在北极。）
