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第2部分:阅读判断(第16~22题,每题1分,共7分)
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. Thats comforting. But its also misleading because theres 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, eventually formed moving plates. Exactly when this shift happened, however, is an open question.
Now, an international group of researchers has an answer. Theyve found new evidence suggesting that Earths crust (地壳) 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 pummeling Earth, keeping its crust in a hot, molten state. After the hard crust formed, much of it sank at various times into the planets hot insides. There, it melted before returning to the surface as lava.
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 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 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.
16 The ground beneath our feet is indeed still.
A Right
B Wrong
C Not mentioned
17 The shape of lands and oceans are slowly changed with the movements of plates.
A Right
B Wrong
C Not mentioned
18 Earth cooled down shortly after it was formed.
A Right
B Wrong
C Not mentioned
19 Scientists once estimated that Earths crust started shifting three billion years ago.
A Right
B Wrong
C Not mentioned
20.It took a long time for the melted crust to become hard.
A Right
B Wrong
C Not mentioned
21.The formation of the Isua supracrustal belt is thought to have started about 3.8 billion years ago.
A Right
B Wrong
C Not mentioned
22. The lsua supracrustal belt is now a popular holiday resort.
A Right
B Wrong
C Not mentioned
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详解雅思阅读考试的基本规律(上)
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