1.优点：展现一个国家的科技能力，给人类提供新能源，提高人们的生活水平；
2.缺点：耗费大量的金钱和精力；
3.你的观点。
注意：1.词数100左右；
2.可以适当增加细节，以使行文连贯。
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2 . Space is where our future is — trips to the Moon, Mars and beyond. Most people would think that apart from comets (彗星) and stars, there is little else out there.
The first piece of space junk was created in the year of 1964, when the American satellite Vanguard I stopped operating.
The major problem with the space trash is that it may hit working satellites and damage travelling spaceship. In addition to this, many pieces of junk may crash with each other and break into pieces which fall back to the Earth.
| A．Future plans include a cooperative effort among many nations. |
| B．The junk floats slowly around the Earth. |
| C．However, since our space journey started, we have left much trash (垃圾) in space. |
| D．It is said that there are now over 500,000 pieces of man-made trash orbiting the Earth at speeds of up to 17, 500 miles per hour. |
| E．It lost its connection with the ground centre. |
| F．To avoid this, scientists have invented several ways for clearing the sky. |
| G．It hasn’t result in any serious problems up to now. |
Throughout history, mankind have been working hard on the space
Imagine
Black holes are one of the most mysterious things in
The photo proves Einstein was right . It makes the general theory of relativity
5 . Are we alone in the universe? A team of scientists announced on January 6, 2015 that they had identified eight planets beyond our solar system, three or four of which orbit in their stars’ “Goldilocks Zone” — the region where temperatures are not too hot or too cold for water, which is a necessary ingredient for life as we know it, to exist liquid form. This may be good news for people hoping that Earth is not the only inhabited world in the universe.
The scientists, led by Dr. Guilermo Torres of the Harvard-Smithsonian Center for Astrophysics, made the discoveries using data collected by the planet-seeking Kepler telescope.
NASA launched Kepler in 2009. Since then, the telescope has identified more than 1,000 planets outside of our solar system. Torres and his team analyzed the data about the eight newly discovered world to determine which ones are most likely to be similar to our Earth.
Among the new discoveries, the scientists say the planets called Kepler438b and 442b are the closest to Earth. Kepler 438b is just about 10% larger than our planet, and gets 40% more of its energy from its star than Earth receives from the Sun. Temperatures there would be about 140 degrees. Kepler 442b is about 33% larger than Earth, but receives 30% less energy from its star. That would make it a potentially chillier world than our own. Torres says it is possible for life to exist and survive in either of those temperatures, but for that to happen, these planets would need to have another key ingredient for life: a heat-trapping atmosphere like Earth’s.
While these findings add to the possibility that life exists beyond Earth, Torres cautions against drawing conclusions, “We are not claiming they are inhabited,” he says. In fact, these planets are so far away that the scientists cannot observe them directly, which can be explanation for why for now it remains unknown whether these planets contain life. But the discovery of planets in their stars’ habitable zones suggests that somewhere out there, some form of alien life may have taken hold.
1. The scientists have identified eight planets, ________.| A．which are suitable for humans to live on |
| B．some of which are possible for life to exist on |
| C．some of which have the same situations as Earth |
| D．which are not too hot or too cold for water to exist on |
| A．Kepler 438b is too hot for any life to exist on. |
| B．Kepler 438b and 442b are the farthest to Earth. |
| C．They have made the discoveries through Kepler. |
| D．They have discovered over 1000 planets in 7 years. |
| A．The water | B．The sunlight |
| C．The soil | D．The atmosphere |
| A．there is a lot left to learn |
| B．they have had decisive gains |
| C．it is the first in human history |
| D．it is certain for life on the planets |
| A．Are We Alone? |
| B．Eye on the Stars |
| C．Discover Another Earth |
| D．Discovery of New Stars to Live on |
6 . On a clear night, you can see a sky paced with stars. But you can’t see planets orbiting any of these stars, even with the strongest Earth—based telescopes. Astronomers reported that they discovered seven Earth—sized planets orbiting a nearby star called TRAPPIST – 1 in February. They had to rely on indirect evidence to tell them that the planets are there. By doing some math, they figured out the number of planets and the distance of their orbits.
TRAPPIST – 1 is a red dwarf (红矮星), much smaller than our sun, but larger than Jupiter (木星). If the sun were the size of a basketball, TRAPPIST – 1would be the size of a gold ball. This star is one of our closest neighbors, just like the moon to the earth in space.
When astronomers using Earth-based telescopes to study TRAPPIST – 1, they noticed that every once in a while, it became slightly dim(昏暗). They decided that a planet must be passing in front of the star, blocking part of the light. This dimming would come and go as the planet orbited the star, passing alternately (交替地) behind and in front of the star regularly.
By making careful observations, astronomers expected to get a rough idea of the planet’s size from the pattern of dimming light. But the light level changed often and not at evenly spaced (均匀间隔的) times. The astronomers had to conclude they were looking at more than one planet! To get additional data, NASA’s spritzer Space Telescope measured TRAPPIST –1’s brightness nearly continuously for 20 days, catching 34 crossings of planets in front of the star. Sorting through the mess of data, the astronomers found that the innermost planet completes its orbit in 1.5 Earth days, while the outermost planet takes 20 days. Once you know how long it takes each planet to complete an orbit, you can work out how far it is from the star compared with the other planets.
The TRAPPIST – 1 planets are not alone. So far, astronomers have found more than 3,400 planets that orbit other stars.
1. How did astronomers know the number of planets orbiting TRAPPIST –1?| A．They used their eyes. | B．They used telescopes. |
| C．They performed some calculation. | D．They made some guess. |
| A．By giving examples. | B．By making comparisons. |
| C．By providing research results. | D．By listing some numbers. |
| A．The telescope’s failure. | B．The cloud floating around. |
| C．The star’s moving. | D．The passing planets. |
| A．The ways to get the information of the planets. |
| B．The introduction of the planets. |
| C．The distances of the planets to the star. |
| D．The astronomers’ effort of exploring TRAPPIST – 1. |
