PREP老版：PREP-1 42题

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PREP老版：PREP1  42题
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.

(A) neutrinos are harmless elementary particles that are produced in nuclear reactions and that
(B) neutrinos, which are harmless, are elementary particles produced in nuclear reactions and which
(C) neutrinos are harmless elementary particles produced in nuclear reactions and which
(D) these harmless elementary particles are produced in nuclear reactions, and neutrinos
(E) these elementary particles, harmless products of nuclear reactions, are neutrinos that
此题我选的E，答案是A.看语法笔记上说E选项these没有指代对象，但我觉得these指代前面的neutrinos。语法笔记后面的解释又没看懂，请牛人指点，谢谢！