单选题 Obsessed with their research on superconductive material, they were {{U}}oblivious of{{/U}} the goings-on around them.
  • A. afraid of
  • B. amazed at
  • C. familiar with
  • D. unaware of
【正确答案】 D
【答案解析】[解析] D项unaware of“不知晓的”，译文：他们专注地研究超导材料，对周围发生的事毫不知情。其余选项的意义与划线词不同。A项afraid of“担心”；B项amazed at“对……感到惊喜”；C项familiar with“对……熟悉”。