单选题 A supernova (超新星) is a star that explodes and then slowly fades to less than its original brightness.
  • A. size
  • B. weight
  • C. radiance
  • D. importance


【正确答案】 C
【答案解析】size：大小、尺寸；weight：重量、分量；importance：重要性、重大；radiance：光辉、辐射，和句子里的brightness是同义词。