16.Scientists said they have found evidence of a giant planet far out in our solar system.
In a statement,the California Institute of Technology(Caltech) said this planet travels a strange"highly elongated orbit in the distant solar system".
The discovery was made by two researchers at Caltech; Konstantin Batygin and Mike Brown.They used mathematical modeling and computer simulations (模擬)to find the planet.
So far,there have not been any direct observations of the planet.
"My jaw hit the floor,"said astronomer Mike Brown,the moment he realized there might be a ninth planet.
The scientists said it would take this planet 10,000 to 20,000 years just to make one full orbit around the sun.The new planet,called"Planet Nine"has a mass about 10 times the size of Earth.
It is believed that the planet orbits,or travels,around the sun from a great distance.The planet Neptune's average distance to the sun is about 4.5billion kilometers.But"Planet Nine"could be 20times farther away from the sun than that.
While they did not get a picture of"Planet Nine"yet,the scientists say they are using the biggest and best telescopes on Earth to try to find it.
Brown and Batygin reported their finding in The Astronomical Journal.They say that this new planet is so large that there should be no doubt that it is a true planet,once they confirm it.
Robert Massey is with the Royal Astronomical Society in London.He told AFP that planets have been predicted before,and then were not found.But,he said the work of the these researchers is definitely worth following up."It would be a really exciting thing to find.At the moment it's simply a prediction(預(yù)測(cè))."
54.What does the underlined sentence in Paragraph 5 mean?A
A.He felt quite shocked
B.He felt on the floor
C.He made a public speech
D.He went on observing
55.What can we know about"Planet Nine"from the text?D
A.It could be the ninth planet discovered since ancient times
B.It could be about 10times as large as the earth
C.It could travel around the Earth on a special orbit
D.Its distance to the sun could be about 90 billion kilometers
56.What's Robert's attitude towards the discovery of"Planet Nine"?D
A.doubtful B.unclear C.worried D.supportive
57.What's the best title for the text?C
A.The discovery of the largest planet
B.The prediction of a ninth planet in solar system
C.Attitudes to"Planet Ninth"in the solar system
D.Values of finding"Planet Ninth"in the solar system.
分析 科學(xué)家表示他們發(fā)現(xiàn)了太陽(yáng)系存在另一大行星的證據(jù).可能是第九顆行星,對(duì)于這第九顆行星科學(xué)家們的不同表現(xiàn)和態(tài)度.
解答 54.A 推理判斷題.根據(jù)句子"My jaw hit the floor.the moment he realized there might be a ninth planet.我的下巴撞到地板上了.當(dāng)他意識(shí)到有第九顆行星的時(shí)候說的話,可見是驚訝的,所以答案選A.
55.D 細(xì)節(jié)理解題.根據(jù)句子The planet Neptune's average distance to the sun is about 4.5billion kilometers.尼普頓星球的平均距離太陽(yáng)約45億公里.所以答案選D.
56.D 推理判斷題.根據(jù)句子he said the work of the these researchers is definitely worth following up.他說,這些研究人員的工作絕對(duì)值得跟進(jìn).可見他對(duì)于發(fā)現(xiàn)第九顆行星是支持的,所以答案選D.
57.C 標(biāo)題歸納題.科學(xué)家表示他們發(fā)現(xiàn)了太陽(yáng)系存在另一大行星,可能是第九顆行星,對(duì)于這第九顆行星科學(xué)家們的不同表現(xiàn)和態(tài)度,所以答案選C.
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