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  3. What do the astronomers in Holland believe? What phenomenon cannot the astronomers find a satisfactory explanation for?

What do the astronomers in Holland believe? What phenomenon cannot the astronomers find a satisfactory explanation for?

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问题 What do the astronomers in Holland believe?
What phenomenon cannot the astronomers find a satisfactory explanation for?
选项 A、The supernova destroyed its hydrogen layers at an earlier stage.
B、The supernova debris contained much hydrogen.
C、The supernova resulted in a quark star.
D、The explosion of the supernova has produced very much antimatter.
答案B
解析
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