题目内容
（请给出正确答案）
A.liquid
B.vapor
C.water drop
D.drip
如果结果不匹配，请 联系老师 获取答案
更多“The planet is so close to its …”相关的问题
A．Y
B．N
C．NG
A．she thought it was great to do interplanetary travel
B．she felt a little bit pity about the shuttle program
C．she thought it was unbelievable to see so fast a change
D．she felt proud to travel to the other planet
A．problems of space travel
B．scientific methods in space exploration
C．the importance of Venus to the earth
D．conditions on Venus
"What excited me most was whether there were planets (行星)in other solar (太阳的) systems where life might exist," he says. "I decided to try to find planets orbiting (沿......轨道运行) other stars like our Sun."
And he did. "My fellow researcher, Paul Butler, and I found our first planet in 1995," Dr. Marcy says. "We worked for ten years without finding anything! But we stuck with it, and our patience paid off."
Since then, the two scientists have discovered 65 of the more than 100 planets found orbiting other stars. Dr. Marcy and Dr. Butler also spotted the first "family" of three planets. In June 2002 they announced another discovery: a Jupiter-like (像木星一样的) planet orbiting star 55 Caned. At first, the two researchers found only planets that orbit close to stars. Recently, the scientists found planets farther out. The planet orbiting 55 Cancri is a major breakthrough: it is the first sighting of a large gas planet about the same distance from the star as Jupiter is from the Sun. Why is this important？ Scientists think that life on Earth may exist because of two special features (征) in our solar system. The first is Jupiter.
"Because it's so big, Jupiter pulls comets and asteroids (小行星), or they all come and hit the Earth." Dr. Marcy explains. "Without Jupiter, life on Earth would likely have been destroyed." A second feature is that Earth is a rocky planet where liquid water, which is necessary for life, can exist. Unlike gas planets, rocky planets like Earth have surfaces where water can gather in pools and seas, which may support life. A huge space exists between the Jupiter-like planet and two other planets that lie close to 55 Caneri. Is there an Earth-like planet in the space, too small for us to notice？ If so, says Dr. Marcy, "We would have two striking similarities to our solar system: a Jupiter-like planet and an Earth-like planet. And there may be life!"
What can we learn about Dr. Marcy from the passage？
A．He is fond of watching Jupiter.
B．He is from a scientist family.
C．He dislikes working with Paul Butler.
D．He is interested in finding life in outer space.
【M1】
What reason is there to think that we may actually detect intelligent life in outer space？ To begin with, modern theories of the development of stars suggest that almost every star has some sort of family of planets. So any star like our own sun (and there are billions of such stars in the universe) is likely to have a planet situated at such a distance that it would receive about the same amount of radiation as the earth.
Furthermore, such a planet would probably have the same general composition as our own; so, allowing a billion years or two--or three--there would be a very good chances for life to develop, if current theories of the origin of life are correct.
But intelligent life7 Life that has reached the stage of being able to send radio waves out into space in a conscious pattern7 Our own planet may have been in existence for five billion years and may have had life on it for two billion, but it is only in the last fifty years that we are capable of sending radio waves into space. From this it might seem that even if there were no technical problems involved, the chance of receiving signals from another planet would be extremely small.
This does not mean that intelligent life at our level does not exist somewhere. There are such an unimaginable number of stars that, even at such miserable odds, it seems certain that there are millions of intelligent life forms scattered through space. The only trouble is, none may be within our reach. Perhaps none never will be; perhaps the distances that separate us from our fellow inhabitants of this universe will forever remain too great to be conquered. And yet it is conceivable that someday we may come across one of them or one of them may come across us. What would they be like, these extraterrestrial(地球以外的) creatures？
If the radio waves had reached our planet one hundred years before, we would have______.
A．sent an immediate answer
B．sent an alarm against extraterrestrial attack
C．sent a short reply
D．sent no answer
Global Warming
1．Smoke is clouding our view of global warming, protecting the planet from perhaps three-quarters of the greenhouse （温室） effect. That might sound like good news, but experts say that as the cover diminishes in coming decades, we are facing a dramatic increase of warming that could be two or even three times as great as official best guesses.
2．This was the dramatic conclusion reached last week at a workshop in Dahlem,Bedin, where top atmosphedc scientists got together, including Nobel prize winner Paul Crutzen and Swedish scientist Bert Bolin, former chairman of the UN's Intergovernmental Panel on Climate Change （IPCC）.
3．IPCC scientists have suspected for a decade that aerosols （浮质） of smoke and other particles from burning rainforest, crop waste and fossil fuels are blocking sunlight
and counteracting the warming effect of carbon dioxide （二氧化物） emissions. Until now,they reckoned that aerosols reduced greenhouse warming by perhaps a quarter, cuttingincreases by 0.2oC． So the 0.6oC of warming over the past century would have been0.8oC without aerosols.
4．But the Berlin workshop concluded that the real figure is even higher--aerosols may have reduced global warming by as much as three-quarters, cutting increases by 1.8oC． If so, the good news is that aerosols have prevented the world getting almost two degrees warmer than it is now. But the bad news is that the climate system is much more sensitive to greenhouse gases than previously guessed.
5．As those gases are expected to continue accumulating in the atmosphere while aerosols stabilize or fall, that means "dramatic consequences for estimates of future climate change", the scientists agreed in a draft report from the workshop.
第 23 题 Paragraph 2_________
【M1】
请根据短文内容，回答题。
So Many "Earths"
The Milky Way (银河) contains billions of Earth-sized planets that could support life. That&39;s the finding of a new study. It draws on data that came from NASA&39;s top planet-hunting telescope.＜br＞
A mechanical failure recently put that Kepter space telescope out of service..Kepler had played a big role in creating a census of planets orbiting some 170,000 stars. Its date have been helping astronomers predict how common planets are in our galaxy. The telescope focused on hunting planets that might have conditions similar to those on Earth.＜br＞
The authors of a study published in The Proceedings of the National Academy of Sciences conclude that between 14 and 30 out of every 100 stars with a mass and temperature similar to the Sun may host a planet that could support life as we know it. Such a planet would have a diameter at least as large as Earth&39;s but no more than twice that big. The planet also would have to orbit in a star&39;s habitable zone. That&39;s where the surface temperature would allow any water to exist as liquid.＜br＞
The new estimate of how many planets might fit these conditions comes from studying more that 42,000 stars and identifying suitable worlds orbiting them. The scientists used those numbers to extrapolate (推算) to the rest of the stars that the telescope could not see.＜br＞
The estimate is rough, the authors admit. If applied to the solar system, it would define as habitable a zone starting as close to the Sun as Venus and running to as far away as Mars. Neither planet is Earthlike (although either might have been in the distant past). Using tighter limits, the researchers estimate that between 4 and 8 out of every 100 sunlike stars could host an Earth-sized world. These are ones that would take 200 to 400 days to complete a yearly orbit.＜br＞
Four out of every 100 sunlike stars doesn&39;t sound like a big number. It would mean, however, that the Milky Way could host more than a billion Earth-sized planets with a chance for life
The Kepler space telescope has been in service for 15 years. 查看材料
A.Right
B.Wrong
C.Not mentioned
As far as astronomers can determine, the entire universe is built of the same matter. They have no reason to doubt that matter obeys the same laws in every part of the universe. Therefore, it is reasonable to guess that other stars, with their own planets, were born in the same way as our own solar system. What we know of life on earth suggests that life will arise wherever the proper conditions exist.
Life requires the right amount and kind of atmosphere. This eliminates all those planets in the universe that are not about the same size and weight as the earth. A smaller planet would lose its atmosphere, a larger one would hold too much of it.
Life also required a steady supply of heat and light. This eliminates double stars, or stars that flare up suddenly. Only single stars that are steady sources of heat and light like our sun would qualify.
Finally, life could evolve only if the planet is just the right distance from its sun. With a weaker sun than our own, the planet would have to be closer to it. With a stronger sun, it would have to be farther away.
If we suppose that every star in the universe has a family of planets, then how many planets might support life？ First, eliminate those stars that are not like our sun. Next, eliminate most of their planets, they are either too far from or too close to their suns. Then eliminate all those planets which are not the same size and weight as the earth. Finally, remember that the proper conditions do not necessarily mean that life actually does exist on a planet. It may not have begun yet, or it may have already died out.
This process of elimination seems to leave very few planets on which earthlike life might be found. However, even if life could exist on only one planet in a million, there are so many billions of planets that this would still leave a vast number on which life could exist.
Astronomers believe that matter in different parts of the universe ______.
A．has different laws
B．has one common law
C．shares the same laws
D．shares no common law
