Unless astronomers ______ their search for extraterrestrial life to stars as exc

游客2025-05-05 5

问题 Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of their time.

选项 A、narrow down
B、boil down
C、tone down
D、let down

答案 A

解析

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Unlessastronomers______theirsearchforextraterrestriallifetostarsasexc