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3.The vast jungles of the Amazon rainforest are home to tribes (部落) mostly isolated from the outside world,whose way of life,largely unchanged for hundreds of years,is now increasingly threatened by modern civilization.
Now,scientists discover they can monitor these"uncontacted tribes"using satellites,which would allow inexpensive and safe tracking of these tribes in order to protect them from outside threats.
In order to help preserve these uncontacted Indians,researchers need accurate estimates of their populations.One way to collect this data involves flying over their villages,but such over-flights are both expensive and could fill these native peoples with fear.Another strategy involves meeting individuals on the ground,but among other risks,scientists could accidentally spread disease to members of the tribes.
Instead,scientists investigated whether satellite images could monitor uncontacted tribes.The result was inspiring.They confirmed their locations and measured the sizes of their village,houses and gardens."We can find isolated villages with remote sensing and study them over time."Walker told Live Science."We can ask:Are they growing?Do they move?"
Surprisingly,based on the sizes of the houses and villages,the scientists find the population densities of these isolated villages are about 10times greater,on average,than other villages of native Brazilian peoples.This may be due to the fact that they have to live closer together because they are not as good at clearing the forest,since they lack modern devices like chainsaws and tractors,the researchers said.The tribes may also be afraid of spreading out due to fear of being attacked by outsiders,Walker said.
The researchers now plan to focus on 29more isolated villages to"look at their ecology-that is,distance from rivers and roads-and use this to model where else we can find more isolated villages,"Walker said.

66.Scientists don't want to meet the Indians on the ground due to the fear thatB.
A.they can't get accurate data   
B.they could pass disease to the Indians
C.they will be attacked by the Indians   
D.they will catch disease from the Indians
67.According to the passage,which of the following about the Indian tribes is NOT true?D
A.They lack modern tools to cut forests. 
B.Their life styles remain unchanged.
C.They live closer together for defense. 
D.They are contacting the outside world.
68.What can we learn from the last paragraph?A
A.More isolated tribes are yet to be discovered.
B.Scientists are able to find 29Amazon tribes in total.
C.It's easy for scientists to find isolated villages.
D.More roads should be built for the tribes.
69.Which of the following might be the best title for the passage?D
A.The Disappearing of the Ancient Amazon Tribes.
B.Discovery of Indian Tribes in Remote Mountains.
C.The Threatening of Modern Civilization to Tribes.
D.Research of Isolated Tribes with Modern Devices.

分析 本文是一篇記敘文.幾百年不曾改變的與世隔絕的亞馬遜部落正隨著現(xiàn)代文明有所發(fā)展.科學(xué)家用衛(wèi)星探測儀探測與世隔絕的亞馬遜部落,了解了他們的居住環(huán)境和生活習(xí)性,利用衛(wèi)星探測儀還會找到更多的部落.

解答 66.B           細(xì)節(jié)理解題.根據(jù)文章的第三段中"scientists could accidentally spread disease to members of the tribes"可知,科學(xué)家不想要直接接觸土著人的原因是他們害怕將病毒傳播給他們.故選B..
67.D           推理判斷題.根據(jù)文章第一段中的"whose way of life,largely unchanged for hundreds of years,is now increasingly threatened by modern civilization."可知,他們的生活方式?jīng)]有改變過,故答案B正確從而排除,答案D錯誤;根據(jù)文章第五段中的"they lack modern devices like chainsaws and tractors"可知,土著人缺乏現(xiàn)代工具砍伐森林,故A是正確的從而排除;根據(jù)第五段中的"This may be due to the fact that they have to live closer together …The tribes may also be afraid of spreading out due to fear of being attacked by outsiders"可知,他們居住在一起,是為防御受到攻擊;故C正確從而排除,因此選D.
68.A         推理判斷題.根據(jù)文章最后一段"use this to model where else we can find more isolated villages,"可知,更多的與世隔絕的部落將會被發(fā)現(xiàn),即越來越多的部落有待人們?nèi)グl(fā)現(xiàn),故選A.
69.D       主旨大意題.根據(jù)文章的內(nèi)容可知,本文主要講了科學(xué)家用衛(wèi)星探測儀探測與世隔絕的亞馬遜部落,了解了他們的居住環(huán)境和生活習(xí)性,利用衛(wèi)星探測儀還會找到更多的部落的事情.故選D.

點評 解答細(xì)節(jié)理解題時,一個常用的方法就是運用定位法,即根據(jù)題干和選項中的關(guān)鍵詞從原文中找到相關(guān)的句子,與選項進行比較從而確定答案;推理判斷題既要求學(xué)生透過文章表面文字信息推測文章隱含意思,又要求學(xué)生對作者的態(tài)度、意圖及文章細(xì)節(jié)的發(fā)展作正確的推理判斷,力求從作者的角度去考慮,不要固守自己的看法或觀點.

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