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(地殼),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 (內部) 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 (山脈) 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 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了地殼、地幔和核心是構成地球的主要的層.科學家研究地球的內部.
解答 25.D.主旨大意題.根據(jù)第四段中的Scientists think that there are other nearby gaps."It is like a window into the interior (內部) of the Earth,"科學家認為,附近還有其他間隙.它就像一個窗戶進入到地球內部.故選D.
26.A.細節(jié)理解題.由第二段中的"The crust,mantle(地幔) and core(地核) are the main layers that make up the planet"可知地殼、地幔和核心是構成地球的主要的層,A選項正確.
27.D.推理判斷題.由第一段中的"It's a mystery that has puzzled scientists"以及下文的介紹可知,科學家們迄今為止沒有弄清楚這個洞是如何形成的.故D選項正確.
28.C.細節(jié)理解題.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選項說法正確.科學家們希望拍攝的是這個區(qū)域而不是這個洞.故C選項切題.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.