首页
登录
职称英语
[originaltext] Today I want to talk about the Earth’s last major climatic sh
[originaltext] Today I want to talk about the Earth’s last major climatic sh
游客
2024-04-18
46
管理
问题
Today I want to talk about the Earth’s last major climatic shift, at the end of the last ice age.
But first, let’s back up a moment and review what we know about climatic change in general. First, we defined "climate" as consistent patterns of weather over significant periods of time.
In general, changes in climate occur when the energy balance of the Earth is disturbed. Solar emergy enters the Earth’s atmosphere as light and is radiated by the Earth’s surface as heat. Land, water, and ice each affect this energy exchange differently. The system is so complex that, to date, our best computer models are only crude approximations and are not sophisticated enough to test hypotheses about the causes of climatic change.
Of course, that doesn’t keep us from speculating. For instance, volcanic activity is one mechanism that might affect climatic change. When large volcanoes erupt, they disperse tons of particles into the upper atmosphere, where the particles then reflect light. Since less light is entering the system of energy exchange, the result would be a cooling of the Earth’s surface.
Of course, this is just one possible mechanism of global climate change. In all probability, a complete explanation would involve several different mechanisms operating at the same time.
10. How does the speaker begin her discussion?
11. What does the speaker mean by the phrase"the energy balance of the Earth?"
12. Why do meteorologists have difficulty testing hypotheses about climatic changes?
选项
A、By categorizing the world’s climate.
B、By defining the term "climate. "
C、By summarizing the previous lecture.
D、By referring to the weather map.
答案
B
解析
听力材料的开头具有一定的迷惑性。说话者说今天要讨论的话题是关于地球最后一次重大的气候变化,但首先要看看大家对气候一般性的了解。说话者两次用了first这个词,表示在讨论之前,要先给“气候”(climate)下个定义,正确答案是B。考生生听课堂教学的内容时,应注意把握一些提示性词语。
转载请注明原文地址:https://tihaiku.com/zcyy/3560694.html
相关试题推荐
[originaltext]M:Hi,Mandy.How’severythinggoing?W:Nottoogood,Isuppose.M
[originaltext]W:Mybikewasstolenrecently.Isitpossibletolendmeyoursfo
[originaltext]W:Mybikewasstolenrecently.Isitpossibletolendmeyoursfo
[originaltext]W:Mybikewasstolenrecently.Isitpossibletolendmeyoursfo
[originaltext]W:Mybikewasstolenrecently.Isitpossibletolendmeyoursfo
[originaltext]W:Mybikewasstolenrecently.Isitpossibletolendmeyoursfo
[originaltext]TelephonebooksintheUnitedStateshavewhite,blueandyel
[originaltext]TelephonebooksintheUnitedStateshavewhite,blueandyel
[originaltext]ThenumberofspeakersofEnglishinShakespeare’stimeises
[originaltext]ThenumberofspeakersofEnglishinShakespeare’stimeises
随机试题
TheSupremeCourt’sdecisionsonphysician-assistedsuicidecarryimportant
横向流动功能
动力原理是指善于利用较小的动力推动管理运动持续而有效地进行下去。()
2016年3月27日。由某施工单位总承包的拆迁安置房工程工地,在拆除塔吊过程中,
教育心理学发展的成熟时期所对应的年代是()A.20世纪20年代到50年代 B
患者,女性,42岁。甲状腺功能亢进症。行甲状腺大部切除术后,切口橡皮管引流。引流
下面关于货币政策对证券市场的影响,错误的是()。A:一国的经济越开放,证券市场的
路基工程施工应按设计要求进行()的动态观测。观测基桩必须置于不受施工影响的稳定地
毒性的上限指标有A.绝对致死量,最大耐受量,最大无作用剂量最小致死量 B.绝对
知识点:腰椎间盘突出症 下列选项中对诊断腰椎间盘突出无帮助的是 A.叩击试验
最新回复
(
0
)