首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
下面的短文后列出了7个句子,请根据短文的内容对每个句子做出判断 :如果该句提供的是正确信息,请选择 A;如果该句提供的是错误信息,请选择 B ;如果该句的...
下面的短文后列出了7个句子,请根据短文的内容对每个句子做出判断 :如果该句提供的是正确信息,请选择 A;如果该句提供的是错误信息,请选择 B ;如果该句的...
admin
2020-12-24
55
问题
下面的短文后列出了7个句子,请根据短文的内容对每个句子做出判断 :如果该句提供的是正确信息,请选择 A;如果该句提供的是错误信息,请选择 B ;如果该句的信息文中没有提及,请选择 C 。
Earth Rocks On
Most of the time, the ground feels solid beneath our feet. That’s comforting. But it’s also misleading because there’s actually a lot going on underground. Masses of land (called plates) slip, slide, and bump against each other, slowly changing the shape of continents and oceans over millions and billions of years.
Scientists know that Earth formed about 4. 5 billion years ago. They also know that our planet was hot at first. As it cooled, its outermost layer, called the crust(地壳) , eventually formed moving plates. Exactly when this shift happened, however, is an open question.
Now, an international group of researchers has an answer. They’ve found new evidence suggesting that Earth’s crust started shifting at least 3. 8 billion years ago. The new estimate is 1.3 billion years earlier than previous ones.
Not long before 3. 8 billion years ago, lots of asteroids(小行星)were hitting Earth, keeping its crust in a hot, melted state. After the hard crust formed, much of it sank at various times into the planet’s hot insides. There, it melted before returning to the surface.
In some places, however, the crust never sank. One of the oldest such places is in Greenland, in an area called the Isua supracrustal (上地壳) belt. The rocky crust there is between 3. 7 and 3. 8 billion years old. The belt was once part of the seafloor, but now it is exposed to air.
The researchers recently took a close look at the Isua supracrustal belt. They noticed long, parallel cracks in the rock that have been filled in with a type of volcanic rock.
To explain this structure, the scientists propose that tension in the crust caused the seafloor to crack open long ago. Hot, liquid rock, called magma (岩浆) , flowed up slowly from deep inside Earth to fill the cracks. Finally, the whole area cooled, forming what we see today.
That explanation, plus chemical clues inside the rock, suggests that the Isua supracrustal belt was once part of a plate under the ocean, beginning around 3. 8 billion years ago.
Scientists once estimated that Earth’s crust started shifting three billion years ago.
选项
A Right
B Wrong
C Not mentioned
答案
B
解析
文章第三段提到“他们发现的最新证据表明地壳的这种转变至少是发生在38亿年以前,这比之前的估计早了13亿年”。也就是之前的估计应为25亿年前,题干“科学家曾经估计地壳的转变发生在30亿年前”不符合题意,所以答案为B。
转载请注明原文地址:https://ti.zuoweng.com/ti/wrsQKKKQ
相关试题推荐
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 TheToughGrassth...
随机试题
15、A.维生素AD B.维生素C C.复合维生素B D.葡萄糖酸钙 E
下列各项中,关于审计业务的三方关系人的表述中不正确的是()。
某施工企业2014年度利润总额8000万元。企业当年发生公益性捐赠支出1000万
下列有关中外合资经营企业利润分配的表述中,符合中外合资经营企业法律制度规定的有(
下列关于账簿内容表述正确的有()。
反应,此温度下平衡时,如p(PCl5)=p(PCl3),则p(C12)等于:
从ADR曲线的形态上看,ADR从低向高超过0.5,并在此上下来回移动几次,是(
我国被列人《世界遗产名录》,没有森严城墙的古城是()。A.丽江B.南京C.西安D.平遥
可摘局部义齿基托蜡型的厚度要适当,一般为A.0.5mmB.1mmC.2mmD.3mmE.3.5mm
港口工程质量检验中,按工程的使用功能、结构形式、施工和竣工验收的独立性划分单位工程。具体规定如下:()。A.码头工程按泊位划分单位工程B.船台工程作为一个单位