Obsessed with their research on superconductive material, they were oblivious of

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问题 Obsessed with their research on superconductive material, they were oblivious of the goings-on around them.

选项 A、afraid of
B、amazed at
C、familiar with
D、unaware of

答案 D

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”。

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