As a result of a supernova explosion, every human being on Earth was bombarded on February 23, 1987, by about 100 billion neutrinos; fortunately, neutrinos are harmless elementary particles that are produced in nuclear reactions and that interact very weakly with matter.
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Aneutrinos are harmless elementary particles that are produced in nuclear reactions and that
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Bneutrinos, which are harmless, are elementary particles produced in nuclear reactions and which
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Cneutrinos are harmless elementary particles produced in nuclear reactions and which
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Dthese harmless elementary particles are produced in nuclear reactions, and neutrinos
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Ethese elementary particles, harmless products of nuclear reactions, are neutrinos that
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正确答案: A