12.Scientists have found amounts of water molecules inside rocks and soil samples from Mars before.But an ancient meteorite(隕石) found recently contains 10times more water and much more oxygen than any Martian meteorite ever before discovered.
What's so wild about this wet discovery?It could mean that the Red Planet once had enough water to have liquid flowing on the planet's surface.
It was once believed that if Mars ever had water at all,its water would have been small amounts of ice below the surface or existing in the soil only as hydrogen and oxygen---the elements that make up water.But recent discoveries have shown that Mars probably had a much wetter history than formerly thought.
The meteorite,nicknamed Black Beauty,was found in Africa's Sahara Desert in 2011.Only about 110 meteorites from Mars have ever been found.Scientists believe most Martian meteorites arrived on our planet during one large asteroid crash(小行星碰撞)that sent rocks falling toward Earth long ago.
Black Beauty is about 2.1 billion years old.Its discovery is the first time scientists have been able to study such an ancient Martian rock.It's also one of the first times scientists have been able to study a piece of the planet's ancient surface.
The sample's water molecules were sent out when scientists heated the meteorite to analyze it.Scientists think the meteorite's hydrogen and oxygen molecules are so plentiful because water was flowing on Mars at the time this meteorite fell to Earth,or because these molecules were once sealed in large quantities in Mars's crust.
Black Beauty might do more than just unlock secrets from the Red Planet's past.These discoveries could also help scientists understand new data about Mars that's being sent from the robotic rovers currently gathering information on the planet.
32.People used to think thatA.
A.there was little water on Mars
B.Mars had a lot of flowing water
C.a(chǎn) large quantity of ice was Mars
D.Mars was much wetter than Earth
33.What do we know about Black Beauty?C
A.It was discovered in Seattle in the USA.
B.It is the biggest of 110 meteorites form Mars.
C.It landed on Earth after an asteroid crash.
D.It has a history of 2.1 million years.
34.How did the scientists research Black Beauty?A
A.By cutting it into pieces.B.By dipping it into water.
C.By burning it on a fire. D.By burying it into a desert.
35.The passage is mainly aboutB.
A.a(chǎn) rock from the center of Mars.
B.a(chǎn) major Martian meteorite discovery
C.a(chǎn) new discovery on the Red Planet
D.a(chǎn) number of meteorites from Red Planet.
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大火星隕石的發(fā)現(xiàn),大火星隕石的發(fā)現(xiàn),但新的發(fā)現(xiàn)推翻了這個想法.
解答 32.A.細(xì)節(jié)理解題.根據(jù)第三段It was once believed that if Mars ever had water at all,its water would have been small amounts of ice below the surface or existing in the soil only as hydrogen and oxygen---the elements that make up water可知人們過去認(rèn)為火星幾乎沒有水;故選A.
33.C.細(xì)節(jié)理解題.根據(jù)第四段Scientists believe most Martian meteorites arrived on our planet during one large asteroid crash(小行星碰撞)that sent rocks falling toward Earth long ago可知黑美人降落在地球在小行星墜毀之后;故選C.
34.A.推理判斷題.根據(jù)第五段It's also one of the first times scientists have been able to study a piece of the planet's ancient surface可知科學(xué)家研究隕石通過將它切割成小部分進(jìn)行研究;故選A.
35.B.推理判斷題.根據(jù)第四段The meteorite,nicknamed Black Beauty,was found in Africa's Sahara Desert in 2011.Only about 110 meteorites from Mars have ever been found可知文章主要是關(guān)于大火星隕石的發(fā)現(xiàn);故選B.
點評 本文屬于說明文閱讀,主要描述了大火星隕石的發(fā)現(xiàn).考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時一定要找到文章中的原句,和題干進(jìn)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(jìn)行合乎邏輯的推理判斷.