E
Could we "terraform" Mars —that is, change its frozen, thin-aired surface into something more friendly and Earthlike? Should we? The first question has a clear answer: Yes, we probably could．Spacecraft, including the ones now exploring Mars, have found evidence that it was warm in its youth, with rivers flowing into vast seas．And right here on Earth, we've learned how to warm a planet: just add greenhouse gases to its atmosphere．Much of the CO2 that once warmed Mars is probably still there, in frozen dirt and polar ice caps, and so is the water．
Most of the work in terraforming, says NASA scientist Chris Mackay, would be done by life itself． "You don't build Mars," Mackay says．"You just warm it up and throw some seeds．" Powerful greenhouse gases could be produced from elements in dirt and air on Mars and blown into the atmosphere; by warming the planet, they would release the frozen CO2, which would quicken the warming and increase atmospheric pressure to the point where liquid water could flow．Meanwhile, says botanist James Graham of the University of Wisconsin, human settlers could seed the red rock with a succession （系列） of ecosystems ?first bacteria and lichens （地衣）, which survive in Antarctica, later mosses （苔藓）, and after one thousand years or so, redwoods．Getting breathable oxygen levels out of those forests, though, could take thousands of years．
However, Mars is in no immediate danger．Some space scientists recently recommended going to the moon or an asteroid （小行星） first, and pointed out the space agency lacks the funds to go anywhere．It didn't estimate the cost of gardening a dead planet．
72．What is the most essential to make Mars fit for living?
A．Turn ice into flowing water． B．Clean the dirty atmosphere．
C．Make the atmosphere more suitable． D．Go to the moon or an asteroid first．
73．What does the author think of the idea ofterraforming Mars?
A．We could do it． B．We couldn't do it．
C．We should do it． D．We shouldn't do it．
74．In the botanist's opinion, man needs to __________.
A．enable Mars to clean its atmosphere
B．build a greenhouse on Mars
C．send some people to settle on Mars
D．cultivate ecosystems from lower to higher life form
75．What is the best title for the passage?
A．Making Mars the New Earth． B．A Good Way to Change the Universe
C．Humans' Great Power． D．Terrible Science and Technology．
科目：高中英语 来源： 题型：阅读理解
请认真阅读下面对话，并根据各题所给首字母的提示，在标有题号的右边横线上，写出一个英语单词的完整、正确形式，使对话通顺。
M: Well, this is it! What do you think of it?
W: I can hardly believe it's real. I've (76)d of seeing it ever since _________
I saw it in books when I was a child. Just thinking of all this being built
by hand more than 2,000 years ago! No (77)w it's one of the _________
wonders of the world.
M: (78) A the started building is more than 2,500 years ago when _________
China was divided into (79)v states. Three of the northern states _________
built defensive walls along their borders to keep (80)o the enemies.
._________
W. But I always thought the wall had been built by Qin Shihuang, the first
(81) E of China. _________
M: Well, yes. In the way, you see, he united the(82)w country in the_________
third century B. C. and one of the things he did was to join the (83)s _________
walls into one big wall and to build more walls from the east coast right
across the length of north China to the west.
W: It is certainly something any nation could be proud of. I hear this is the
only human(84)c on the earth that can be seen from the moon. _________
By the way, how tall is the wall?
M: The average (85) h is 7.8 meters; the average width is 6.5 meters_________
at the base and 4.5 meters at the top. Would you like to go up to the top?
W: Yes! I'd like to have a look from the top.
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
请认真阅读下面对话，并根据各题所给首字母的提示，在答题卡上标有题号的横线上，写出一个英语单词的完整、正确形式，使对话通顺。
K=Karen S=Selina
K: You’re late again.
S: Sorry, but there was a traffic （76） j .
K: It’s to ways the same excuse. Try to think of something better next time.
S: But I’m telling the truth! There was an （77） a in the cross-harbor tunnel. I don’t think buy one. It is hurt but it （78） t the police over an hour to clear it. Anyway, how are you? You look a bit tired.
K: Well, actually, I’ve been （79） q with my grandmother again. I feel sad because it is go （80） w , she blames me, even though it’s not my fault.
S: What did your grandma say?
K: her favorite expression is “Young people are not as well behaved as they （81） u to be,” She always complains that I don’t show her enough （82） r .
S: Well, try and understand her. She can’t do all the things she did （83） w she was young. It must be very frustrating. Just think, one day we’ll be old…
K; You’re right. I should be more （84） u . I think I’ll buy her a present and apologize.
S: Right. Now you are feeling a bit better, it’s your turn to help me. Could you give me a hand with my maths homework?
K: Maths again! Okay, girl can we find somewhere to （85） e first? I’m starving！
查看答案和解析>>
科目：高中英语 来源：2012-2013学年河南省焦作市高三第二次模拟考试英语试卷（解析版） 题型：信息匹配
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项为多余选项。
Q&A
Question: I come from a poor family, and my parents do what they can to pay for my education. What I want to do is let my parents live a happy and comfortable life. Where can I find riches? Do I need to leave school and find a well-paid job?
Answer: You are a considerate child. 1 An African farmer heard tales about other farmers who discovered diamond mines. These tales excited the farmer so much that he could hardly wait to sell his farm and hunt for diamonds himself.
So he sold the farm and spent the rest of his life wandering the African continent, searching unsuccessfully for the gleaming （闪烁的）stones. 2
Meanwhile, back on the farm, the man who had bought his farm happened to be crossing a small stream on the farm one day. 3 He picked it up. It was a sparkling stone — a good size stone — and, admiring it, he later put it on his mantel（壁炉架）.
Several weeks later, a visitor looked closely at it, then he nearly became unconscious. He told the farmer it was one of the largest diamonds ever discovered. The farmer said that the stream was full of these brilliant stones, and his farmland was covered with them. 4
If the first farmer had taken time to study and prepare himself — to learn what diamonds looked like in their rough state w and to thoroughly explore the farm he had before looking elsewhere, his wildest dreams would have come true. 5
A．I’d like to give you some advice on how to find the riches.
B．Now do you have any idea of what you should do to find the riches?
C．Finally, he threw himself into a river and drowned.
D．However, something special he was carrying dropped into the stream.
E. Needless to say, the farm turned out to be the most productive diamond mine.
F. Before I answer your questions, I want to tell you a story.
G. Suddenly he saw something gleaming at the bottom of the stream.
查看答案和解析>>
科目：高中英语 来源：2010届江西省高三第四次月考 题型：其他题
第四部分：写作（共两节，满分35分）
第一节 对话填空（共10小题；每小题1分，满分10分）
阅读下面的对话，掌握其大意，并根据首字母的提示，写出一个英语单词的完整，正确形式，使对话通畅。
R—Rose L—Lisa
L: Hi, Rose, you look pale today, What’s (76) h to you?
R: Nothing serious, I was told that I had been (77)a to Zhejiang University.
L: Well, you should have been happy about that, That’s exciting news, (78) a all. And your parents will take pride in you.
R: That’s true, but that means a problem, too. You know, school (79) e have been increasing
rapidly these years. What worries me is that my family is too poor to afford them.
L: Well, what do your parents do? Do they have (80) j with fixed income (收入)?
R: My father (81) u to, but he was laid off years ago. With my mother earning the bread for the
family of five, it is often hard to make ends meet.
L: That’s really a problem then. But you can consider (82) b money from your relatives and
even from the bank.
R: Yes, I think so. And my head teacher told me that a few days ago.
L: By the (83) w , what will you learn there?
R: Computer science is my (84) m .
L: That sounds great! I wish I could go to the same university and learn the (85) s subject too.
R: you surely can. I know you are a top student in your class. Work hard and good luck!
查看答案和解析>>
科目：高中英语 来源： 题型：
M: Miss Gao, I am invited to a party at an American home. 51 .
W:You should follow some rules. First, you should take a small gift such as flowers or wine for your host or hostess. And, 52 . If the dinner time is 7:00 pm, don’t arrive before 6:30 or after 7:30 without calling.
M: 53 .
W: Be sure to praise your host or hostess for the meal.
M: 54 .
W: You can, but you shouldn’t stay too long. 55 .
M: I learned a lot today. Thanks for your advice.
W: That’s all right.
| A. I’m a little nervous. B. How can I do at last? C. You must arrive on time. D. What should I do during the dinner? E. Could you tell me how I can be a polite guest? F. Can I have a talk with the host or hostess after dinner? G. Finally, thank your host or hostess for the dinner when you leave. |
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com
