题目选项分析

Astronomers have uncovered evidence that a star as bright as the full moon exploded into view 340,000 years ago, emitting dazzling radiation that could have disrupted Earth's protective ozone layer and sunburned our Stone Age ancestors.

Astronomers have uncovered evidence of a star as bright as the full moon that exploded into view 340,000 years ago and that emitted dazzling radiation that could have disrupted Earth's protective ozone layer and sunburned our Stone Age ancestors.