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题库 / Prep2007E1-SC-42
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.
neutrinos are harmless elementary particles that are produced in nuclear reactions and that
neutrinos, which are harmless, are elementary particles produced in nuclear reactions and which
neutrinos are harmless elementary particles produced in nuclear reactions and which
these harmless elementary particles are produced in nuclear reactions, and neutrinos
these elementary particles, harmless products of nuclear reactions, are neutrinos that
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(B) 句子结构复杂;and which…定语从句没有并列对象，不能与前面which引导的插入语并列。
(C) and which…没有并列对象。
(D) these在这里没有明确指代; and后面的句子与前面不连贯
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