请教PREP1 42

niswzzhn

42.  (26647-!-item-!-188;#058&002738)

 

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

正确答案是A没有异议，想问一下D和E选项中的these没有明确指代是什么意思啊？我记得新东方的刘苏老师说过this, that, these和those不能单独存在，这里的these有修饰对象，为什么错呢？谢谢大家。

ciscogeek

particles 前面没有出现过阿，所以不能用these.
these neutrinos are harmless particles， 也许还可以，但也没有必要特指。