单选题
Obsessed with their research on superconductive material, they were
oblivious of
the goings-on around them.
【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”。