試題詳解

43. According to the article, why did IAU deprive Pluto of the status as a planet?
(A) IAU thought that Pluto is too big in size to be classified as a planet.
(B) IAU was afraid that there would be too many planets in the Solar System.
(C) New telescope technologies showed that Pluto was not part of the Solar System.
(D) IAU thought that Pluto was not bright enough to be a planet.
(E) IAU thought that Pluto should belong to the Kuiper Belt.