第四部分 閱讀理解（共六篇）
第四十九篇
U.S. Scientists Confirm Water on Mars
Laboratory tests aboard NASA's Phoenix Mars Lander2 have identified water in a soil sample; the lander's robotic arm delivered the sample Wednesday to an instrument that identifies vapors produced by the heating of samples.
"We have water," said William Boynton of the University of Arizona, lead scientist for the Thermal and Evolved-Gas Analyzer3, or TEGA. "This is the first time Martian water has been touched and tasted. "
The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench" into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of, what its water is like, and whether it is or has ever been a possible habitat for life.
The soil sample came from a trench approximately 2 inches deep. When the robotic arm first reached that depth, it hit a hard layer of frozen soil. Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop. Most of the material in Wednesday's sample had been exposed to the air for two days, letting some
of the water in the sample vaporize away and making the soil easier to handle.
"Mars is giving us some surprises," said Phoenix principal investigator Peter Smith of the University of Arizona. "We're excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck, different from what we expected, from all the Mars simulation testing we've done so far. "
Since landing on May 25, Phoenix has been studying soil with a chemistry lab, TEGA, a microscope, a conductivity probe and cameras. The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.
The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.
"It's a 30-watt light bulb giving us a laser show on Mars," said Victoria Hipkin of the Canadian Space Agency.
A full-circle, color panorama of Phoenix's surroundings also has been completed by the spacecraft.
"The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see," said Mark Lemmon of Texas A & M University, lead scientist for Phoenix's Surface Stereo Imager4 camera. "They help us plan measurements we're making within reach of the robotic arm and interpret those measurements on a wider scale. "
詞匯：
foil v. 挫敗，使成泡影 conductivity n. 傳導(dǎo)陡，導(dǎo)電勝
scoop n. 鏟斗 thaw v. 融化，融解
vaporize v. 使蒸發(fā)，使汽化 panorama n. 全貌，全景圖
注釋：
1．NASA：National Aeronautics and Space Administration(美國國家航空航天局)的縮寫。NASA總部設(shè)在華盛頓哥倫比亞特區(qū)，是美國政府系統(tǒng)中的航空航天科研機(jī)構(gòu)，負(fù)責(zé)組織和協(xié)調(diào)美國航空航天的研究工作并提供咨詢。
2．Phoenix Mars Lander：鳳凰號火星登陸器。其使命是探測火星地表下的冰層，分析冰層是否曾經(jīng)融化產(chǎn)生液態(tài)水，并計劃檢測火星土壤是否含有生命存活的有機(jī)物。
3．Thermal and Evolved—Gas Analyzer：熱力與先進(jìn)氣體分析儀
4．Stereo Imager：立體圖像
練習(xí)：
1. What was discovered by NASA's Phoenix Mars Lander on Mars?
A）Vast lakes.
B）Flowing rivers.
C）Water in a soil sample.
D）Living things.
2. Why did the first two attempts to deliver samples fail?
A）The sample vaporized away.
B）Fresh material was exposed to the air.
C）The samples got stuck inside the scoop.
D）The robotic arm hit a hard rock.
3. Which one of the following statements is NOT meant by the writer?
A）Scientists have been trying to break the ice-rich layers of soil on Mars.
B）Scientists have been surprised by how the soil on Mars behaves.
C）Scientists have been trying to fend out if there is life supporting material on Mars.
D）Scientists have been trying to know if water ice will melt.
4. Where are the scientists involved in the research from?
A）They are from America.
B）They are from Canada.
C）They are from both America and Canada.
D）They are from neither America nor Canada.
5. Which of the following do you think is the best description of Phoenix's Surface Stereo Imager Camera, according to your understanding of the passage?
A）It imitates human vision and is able to capture three-dimensional images.
B）It imitates human voice and is able to record slight sounds while taking photos.
C）It takes clear photos that show every detail of the object.
D）It is this particular type of camera that can take wide angle pictures.
答案與題解：
1．C 短文的第一段告訴我們，NASA科學(xué)家曾經(jīng)說過，火星上有廣闊的湖泊，流動的河流，以及可能有支撐生命的潮濕環(huán)境。但這些只是科學(xué)家的假設(shè)，不是NASA’S Phoenix Mars
Lander的發(fā)現(xiàn)，所以只有C是正確選擇。
2．C 短文第五段的第三句提供了答案。
3. A 第六段的第三句所述內(nèi)容說明B是作者想要表達(dá)的意思，第七段的最后一句所述內(nèi)容說明C和D也是作者想要表達(dá)的意思。文章里沒有A所表述的內(nèi)容。
4．C 短文的第八和第九段提到了加拿大宇航局的科學(xué)家為鳳凰號的火星探索提供了激光設(shè)
備。
5． A短文最后一段的第一句：A full—circle，color panorama of Phoenix’S surroundings also has been completed…告訴我們，使用這種照相機(jī)可以拍攝全景照片。panorama：全景，全景攝影。
