2. 外语
  3. Scientists said they have found evidence of a giant planet far out in our solar system. In a statement, the California Institute

Scientists said they have found evidence of a giant planet far out in our solar system. In a statement, the California Institute

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问题    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 very strange "long and thin 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(模拟) to find the planet. So far, there have not been any direct observations of the planet.
   "My jaw hit the floor, " said astronomer(宇航员) 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. If they are right, the newly found planet would be the ninth planet in our solar system. Pluto (冥王星) had been called the ninth planet until 2006, when it was renamed a " dwarf planet".
   Actual confirmation of a ninth planet would be very big news. "This would be a real ninth planet, " Brown said in the statement. " There have only been two true planets discovered since ancient times, and this would be a third. It’ s a pretty substantial chunk of our solar system that’ s still out there to be found, which is pretty exciting. "
   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 "Planet Nine". They are also working on improving their computer simulations. They want to find out more about "Planet Nine’ s" orbit, and its impact on the outer part of our solar system.
According to the scientists, ______.
选项 A、the planet is ten times larger than the Earth
B、it takes the planet less than 10, 000 years to make a full orbit
C、Pluto was once thought to be the ninth planet in the solar system
D、Pluto was given a new name after it was discovered in 2006
答案C
解析 细节题。根据文章第三段最后一句可知，冥王星一直被称为“第九颗行星”，直到2006年更名为“矮行星”，故选项C(冥王星曾被认为是太阳系的第九颗行星)正确。由第三段第二句可知，该行星的大小是地球的10倍，不是比地球大10倍，故选项A(这个行星比地球大10倍)错误。由第三段第一句可知，该行星绕太阳运行一周需要1万到2万年，故选项B(该行星沿轨道转一周需要不到1万年的时间)错误。由第三段最后一句可知，冥王星早就被发现了，只是在2006年被重新命名了，故选项D(冥王星在2006年被发现后被冠以一个新的名字)错误。
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