题目内容
10.They may be tiny,and live for just three months,but ants could be the key to solving climate change.Rough harvester ants have been found to"weather"minerals in sand to produce calcium carbonate,also known as limestone (石灰岩).When the ants make this limestone,the process traps carbon dioxide in the rock,ultimately removing it from the atmosphere.
It is uncertain how the minerals are changed,however,and theories vary a lot from ants licking the sand to excreting (排泄) the substance.
Professor Dorn buried sand at six sites in the Catalina Mountains in Arizona,and Polo Duro Canyon in Texas,25 years ago.Every five years,he measured the minerals in the sand,and discovered the ants broke down minerals up to 300 times faster than sand left undisturbed.
Professor Dorn believes the ants collect calcium and magnesium (镁) and use these elements to make the limestone.This may occur when ants lick sand grains to stick them to the walls of their nests.Alternatively,the limestone could be created from bacteria in the insects gut before it is excreted.This process is similar to what's known as carbon sequestration (隔离).
Natural carbon sequestration is the process on Earth that manages the carbon dioxide expelledby animals and humans.Trees and the oceans help trap this carbon dioxide.
Another method is geological sequestration where the carbon dioxide is pumped into underground chamber,or into areas full of calcium and magnesium.Carbon dioxide reacts with these elements to form limestone.It is this latter method that Dorn believes the ants perform naturally.
But Professor Dorn claims it is still unknown how much atmospheric carbon is removed by the ants.
32.The fifth paragraph is mainly aboutB.
A.how ants break down limestone
B.how ants change minerals into limestone
C.how ants decorate their nests with sand
D.how ants use sand to kill bacteria
33.What is the possible meaning of the underlined word"expelled"?A
A.sent out B.taken in C.broken up D.given away
34.According to Dorn,scientists still don't knowC.
A.the effect of CO2 on ants'survival
B.the method of ants'removing CO2
C.the amount of CO2removed by ants
D.the time when ants absorb CO2
35.The main idea of the passage is thatD.
A.ants build their nests to keep CO2 out
B.ants use limestone to absorb a great deal of CO2
C.ants are pioneers in solving global warming
D.ants may remove CO2 from atmosphere.
分析 本文主要介绍当蚂蚁制造石灰石时,这个过程会在岩石中捕获二氧化碳,最终将其从大气中除去.
解答 32.B 细节理解题.根据本段的首句Professor Dorn believes the ants collect calcium and magnesium (镁) and use these elements to make the limestoneDorn教授认为,蚂蚁收集的钙和镁的利用这些元素制造石灰石,所以答案选B.
33.A 猜测词义题.根据前一句This process is similar to what's known as carbon sequestration 这个过程类似于所谓的碳封存.和后文句子Trees and the oceans help trap this carbon dioxide树木和海洋有助于捕获二氧化碳,那么 manages the carbon dioxide expelledby animals and humans则可以理解为管理动物和人类排出的二氧化碳的问题,所以expelled的意思是排除sent out,所以答案选A.
34.C 细节理解题.根据最后一句But Professor Dorn claims it is still unknown how much atmospheric carbon is removed by the ants.是Dorn教授声称,它仍然是未知的多少是由蚂蚁去除大气中的碳.所以答案选C.
35.D 主旨大意题.根据句子When the ants make this limestone,the process traps carbon dioxide in the rock,ultimately removing it from the atmosphere.
当蚂蚁制造这种石灰石时,这个过程会在岩石中捕获二氧化碳,最终将其从大气中除去.本文科学家通过研究告诉人们蚂蚁可以从大气中除去二氧化碳.所以答案选D.
点评 阅读理解题测试考生在阅读基础上的逻辑推理能力,要求考生根据文章所述事件的逻辑关系,对未说明的趋势或结局作出合理的推断;或根据作者所阐述的观点理论,对文章未涉及的现象、事例给以解释.考生首先要仔细阅读短文,完整了解信息,准确把握作者观点.
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