12. From when was Pluto seriously questioned about its planetary status? (A) As early as 1930. (B) More than a decade ago. (C) When the Kuiper Belt was discovered. (D) When Quaoar was discovered. 13. The sentence "In short, there is none." (para. 7) can be paraphrased as which of the following? (A) There is no problem with Pluto's planetary status. (B) There is not much difference between Pluto and other planets. (C) There is yet no scientific definition of the term "planet." (D) There is no clear distinction between planets and stars. 14. Which of the following does not support the statement that Pluto is our "solar system's oddest planet"? (A) It is farthest from the sun. (B) It is unusually small. (C) Its orbit is too oval. (D) It mainly consists of dust and ice. 15. The word "commotion" in the expression "New York's Hayden Planetarium caused a commotion two years ago" (para. 8) can be replaced by______________ (A) exchange of opinions (B) thorough investigation (C) wild imagination (D) agitated confusion
