Question

17．Beijing had its biggest snowfall since 1951．Britain is suffering through its longest cold snap （寒潮） since 1981．And freezing weather is hitting the Deep South，including Florida's orange groves and beaches．
    Whatever happened to global warming？
    Such weather doesn't seem to fit with warnings from scientists that the Earth is warming because of greenhouse gases．But experts say the cold snap doesn't contradict global warming at all-it's just a temporary phenomenon in the long-term heating trend．"It's part of natural variability，"said Gerald Meehl，a senior scientist．With global warming，he said，"we'll still have record cold temperatures．We'll just have fewer of them．"
    Scientists say man-made climate change does have the potential to cause more frequent and more severe weather extremes．But experts did not connect the current cold snap to climate change．
    So what is going on？
"We basically have seen just a big outbreak of Arctic air over populated areas of the Northern Hemisphere"，Arndt said．
In the atmosphere，large rivers of air travel roughly west to east around the globe between the Arctic and the tropics．This air flow acts like a fence to keep Arctic air restricted．But recently，this air flow has become bent into a zigzag （之字形） pattern，wandering north and south．If you live in a place where it brings air up from the south，you get warm weather．In fact，record highs were reported this week in Washington state and Alaska．
But in the eastern United States，like some other unlucky parts of the globe，Arctic air is coming from the north．And that's how you get a temperature of 3 degrees in Beijing，a reading of minus-42 in mainland Norway，and 18 inches of snow in parts of Britain．The zigzag pattern arises naturally from time to time，but it is not clear why it's so strong right now．
71．What is the best title of the text？D
A．Freezing weather is hitting the Deep South．
B．We'll still have record cold temperatures．
C．The air flow has become a zigzag pattern．
D．Cold snap doesn't contradict global warming．
72．With global warming，we willA．
A．also meet with severe cold snap
B．have more hot temperatures forever
C．never experience cold temperatures
D．have more cold temperatures
73．According to experts，the current cold snapB．
A．suggests that the climate has changed greatly
B．is not related to the climate change
C．shows that the climate will turn cold
D．is affected by global warming
74．Beijing had its biggest snowfall since 1951 because ofC．
A．a fence from the Arctic                  
B．a cooling trend in climate
C．a big outbreak of Arctic air             
D．its large population
75．We can conclude thatA．
A．not all the parts of the Northern Hemisphere are cold in face of the cold snap
B．the zigzag pattern arises naturally accidentally
C．Beijing will get cold weather next year
D．Washington state and Alaska will not face cold weather next year．

Answer 1

分析 本文为科教文，介绍了寒潮与气候变暖的情况．

解答 71-75：DABCA
71．答案D．主旨大意题．根据第三段"Such weather doesn't seem to fit with warnings from scientists"和"experts say the cold snap doesn't contradict global warming at all"，结合全文可知，文章主要讲寒潮并不能抵触气候变暖．故选D．
72．答案A．细节理解题．根据第三段"With global warming，he said，"we'll still have record cold temperatures．We'll just have fewer of them"可知，随着气候变暖，我们可能还会遭遇寒潮．故选A．
73．答案B．细节理解题．根据第三段"experts say the cold snap doesn't contradict global warming at all-it's just a temporary phenomenon in the long-term heating trend．"It's part of natural variability，"said Gerald Meehl，a senior scientist"可知，寒潮是气候变化中的一种现象，故选B 寒潮也暗示着气候的巨大改变，
74．答案C．细节理解题．根据第六段""We basically have seen just a big outbreak of Arctic air over populated areas of the Northern Hemisphere"，Arndt said"可知，选C．
75．答案A．推理判断题．根据倒数第二段"But recently，this air flow has become bent into a zigzag （之字形） pattern，wandering north and south．If you live in a place where it brings air up from the south，you get warm weather．In fact，record highs were reported this week in Washington state and Alaska"可知，不是北半球的所有地区都冷，如果有来自南方的气流，那个地区不会太冷，像华盛顿和阿拉斯加．故选A．

点评 科普类的阅读理解包含介绍科学知识、社会知识的短文．阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等．如果是介绍社会现象的文章，要掌握所谈现象的内涵．答题技巧：1．加强整体意识，把握文章的主要内容．在阅读的时候可给段落标上序号，并给重要的句子和关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源．2．审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式．3．定位阅读，强化对应意识．同时要注意原文利用和自我加工相结合．