Half of the world’s population is affected by Asian monsoons(季風), but monsoons are difficult to predict. American researchers have put together a 700-year record of the rainy seasons, which is expected to provide guidance for experts making weather predictions.
Every year, damp air masses,known as monsoon,produce large amounts of rainfall in India, East Asia, Northern Australia and East Africa. All this wet air is pulled in by a high pressure area over the Indian Ocean and a low pressure area to the south.
According to Edward Cook , a weather expert at Columbia University in New York., the complex nature of the climate systems across Asia makes monsoons hard to predict. In addition, climate records for the area are too recent and not detailed enough to be of much use. Therefore, he and a team of researchers spent more than fifteen years traveling across Asia, looking for trees old enough to provide long-term records. They measured the rings, or circles, inside thousands of ancient trees in more than 300 places.
Rainfall has a direct link to the growth and width of rings on some kinds of trees. The researchers developed a document they are calling a Monsoon Asia Drought Atlas. It shows the effect of monsoons over seven centuries, beginning in the 1300s.
Professor Cook says the tree-ring records show periods of wet and dry weather. “If the monsoon basically fails or is a very weak one, the trees affected by monsoons at that location might put on a very narrow ring. But if the monsoon is very strong, the trees affected by that monsoon might put on a wide ring for that year. So, the wide and narrow ring widths of the chronology that we developed in Asia provide us with a measure of monsoon variability.” With all this information, researchers say they can begin to improve computer climate models for predicting the behavior of monsoons.
“There has been widespread famine and starvation and human dying in the past in large droughts. And on the other hand, if the monsoon is particularly heavy, it can cause extensive flooding.” said Eugene Wahl, a scientist with America’s National Oceanic and Atmospheric Administration. “So, to get a sense of what the regional moisture patterns have been, dryness and wetness over such a long period of time in great detail, I would call it a kind of victory for climate science.”
【小題1】What’s the passage mainly about?

A.The effects of Asian monsoons.  
B.The necessity of weather forecast. 
C.The achievements of Edward cook.  
D.A breakthrough in monsoon prediction. 
【小題2】It is difficult for experts to predict Asian monsoons because _______.
A.it is hard to keep long-term climate records.  
B.they are formed under complex climate systems. 
C.they influence many nations. 
D.there is heavy rainfall in Asia. 
【小題3】What can be inferred from the passage?
A.Long and detailed climate records can offer useful information for monsoon research. 
B.The Monsoon Asia Drought Atlas has a monsoon record for about 1,300 years. 
C.The trees affected by monsoon grow fast if the monsoon is weak. 
D.The rainfall might be low although the monsoon is strong in monsoon-affected areas. 
【小題4】According to Professor Cook, the rings of the trees _______.
A.determine the regional climate. 
B.have a great influence on the regional climate. 
C.offer people information about the regional climate.  
D.reflect all kinds of regional climate information. 
【小題5】Which of the following best describes the tone of this passage?
A.Matter-of –fact B.Pessimistic C.Humorous D.Friendly. 


【小題1】D
【小題2】B
【小題3】A
【小題4】C
【小題5】A

解析試題分析:
因為亞洲季風是在復雜的氣候條件下形成的,所以很難預測。本文介紹了科學家利用樹木的年輪了解歷史上季風的發(fā)生規(guī)律,以便更好預測未來季風的發(fā)生。
【小題1】主旨大意題。文章開頭在介紹季風造成的危害后指出季風發(fā)生的不確定性導致其難以預測。接下來介紹了科學家通過觀察研究樹木年輪,極為詳細地了解了過去相當長時期內(nèi)季風的發(fā)生規(guī)律,應被視為a kind of victory for climate science (氣候科學的勝利)。故D項正確。breakthrough: 突破。
【小題2】 細節(jié)題。由…the complex nature of the climate systems across Asia makes monsoons hard to predict.可知,亞洲復雜的氣候系統(tǒng)導致季風難以預測。故答案為B。
【小題3】推斷題。由最后一段Eugene Wahl的話可以推知。B項數(shù)據(jù)錯誤,The Monsoon Asia Drought Atlas對于季風的記錄為700年。C、D兩項錯誤明顯。雨水不足時,樹木生長慢而不是快;季風強勁時,降雨量應該大而不是小。故答案為A。
【小題4】細節(jié)題。由第五段So, the wide and narrow ring widths of the chronology that we developed in Asia provide us with a measure of monsoon variability.一句可知,樹木年輪的寬窄向我們提供了一個衡量季風種類惡尺度。故C項正確。A, B兩項顛倒了因果關系;D項犯了擴大化的錯誤。
【小題5】本文可觀敘述了亞洲季風的危害、難以預測性以及科學家們的工作和他們的成果,沒有作者個人的觀點或明顯的個人情感。故答案選A. matter-of-fact: 就事論事的、客觀的。pessimistic: 悲觀的。humorous: 幽默的。friendly: 有好的。
考點:說明文。

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