题型:阅读理解 题类:常考题 难易度:普通
山东省枣庄市第八中学东校区2017-2018学年高二下学期英语期末考试试卷
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.
Thanks to exchange programmes an increasing number of young students are following educational courses in foreign countries. The Erasmus Programme, which started in 1987, is a European Union student exchange programme. It provides opportunities for young people from Europe to study in a foreign country for shot An intercontinental version of the programme, known as Erasmus Mundus, has existed since 2003, providing non-Europeans the opportunity to study in Europe.
Student's name: Paul Dupont Erasmus trip: Lyon-Aberdeen Time: in 2007 | Cool! What an amazing time that was! We had joy, we had fun, we had seasons in the sun! To me, Erasmus means discovering a completely new lifestyle You live together with new friends in a different country. Sorry, the heating system in our apartment was horrible and the food was strange, but hey... anyhow. It's amazing! | |
| Student's name: Beatrice Giletti Erasmus trp: Verona-Du blin Time: in 2008 | I went to Dublin, in Ireland. It was a great discovery, which opened up the world to me and I made many friends from different countries and cultures. The experience changed my life. I felt richer, smarter and happier after my time on Erasmus. My English became almost fluent and I knew so much about the world and about the people who live in it... Internationality has become part of my life, and I could not imagine living or working in a non-multicultural or non-multinational environment. |
Student's name: Wilmie Boot Erasmus trip: Rotterdam—Naples Time: in 2009 | When I first arrived, the first of the city of Naples struck me and I loved it from the first second! The language is a beautiful mixture of Italian, Greek, Latin, Spanish and the influences of the villages surrounding Naples. I have wonderful memories of my year in the Universita Federico Ⅱ in Naples and the time spent in our dormitory, where I was the only foreigner among the Italian students. If I were to do it all over again, I wouldn't change a thing! | |
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