题目内容
13.IT'S a mystery that has puzzled scientists.Five years ago,researchers found an area in the Atlantic Ocean seabed,where a part of the Earth's outer layer,or crust(地壳),is missing.A thick layer of dark green rock,which is usually found deep inside the planet,lies exposed.The crust,mantle(地幔) and core(地核) are the main layers that make up the planet.The mantle rests between the crust and the core.
Last month,a team of 12British scientists set off on a six-week trip to study the hole in the crust.
The hole is about 4,800meters below sea level and is believed to be more than 48,000meters long and more than 48,000meters wide.Scientists think that there are other nearby gaps."It is like a window into the interior (内部) of the Earth,"says scientist Bramley Murton,who is part of the research team.
The site where the hole is located is part of a ridge (山脉) of undersea volcanoes.There,two of the plates that make up the Earth's surface meet.The plates are always moving.When the plates move away from each other,lava rushes up from the mantle to fill the gap and form a new crust.But this did not happen in the area where the hole is located.
The hole is giving researchers a good opportunity to study what's below the Earth's surface.The team will use a special robotic tool to film the area and get samples of the exposed mantle.They hope to study everything from the chemistry of the oceans to how the Earth's surface behaves under the sea.
25.What's the title for the passage?D
A.How to study the earth.
B.The formation of the earth.
C.A hole in the earth.
D.Studying the inside of the earth.
26.For the main layers of the earth,which one is right?A
A.crust,mantle,core B.seabed,crust,mantle
C.seabed,mantle,core D.crust,seabed,core
27.How does the hole come into being?D
A.It's because of a volcano eruption.
B.It's because of the plates movements
C.It's because lava rushes up from the mantle
D.It's not clear from the passage.
28.By studying the hole,the scientists want to do the following exceptC.
A.knowing what's below the Earth's surface
B.getting samples of the exposed mantle
C.getting the film of the hole
D.studying the chemistry of the oceans.
分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了地壳、地幔和核心是构成地球的主要的层.科学家研究地球的内部.
解答 25.D.主旨大意题.根据第四段中的Scientists think that there are other nearby gaps."It is like a window into the interior (内部) of the Earth,"科学家认为,附近还有其他间隙.它就像一个窗户进入到地球内部.故选D.
26.A.细节理解题.由第二段中的"The crust,mantle(地幔) and core(地核) are the main layers that make up the planet"可知地壳、地幔和核心是构成地球的主要的层,A选项正确.
27.D.推理判断题.由第一段中的"It's a mystery that has puzzled scientists"以及下文的介绍可知,科学家们迄今为止没有弄清楚这个洞是如何形成的.故D选项正确.
28.C.细节理解题.由最后一段中的"The hole is giving researchers a good opportunity to study what's below the Earth's surface.The team will use a special robotic tool to film the area and get samples of the exposed mantle.They hope to study everything from the chemistry of the oceans to how the Earth's surface behaves under the sea"可知,A、B、D选项说法正确.科学家们希望拍摄的是这个区域而不是这个洞.故C选项切题.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
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