[求助]prep1-42

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.

(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

answer is A

why not  c? so many thx!

(A) neutrinos are harmless elementary particles that
            are produced in nuclear reactions and that  平行

(C) neutrinos are harmless elementary particles produced in nuclear reactions and which     不平行

顶上去，恳请哪位nn解答一下。

不是nn,说说我的想法

E选将原来的主语neutrinos变为了particles

又将原来形容neutrinos的harmless
            products
            of
            nuclear
            reactions

变成了可有可无的插入句

不知道这样子句子重心的变换
        足够当排除选项的理由吗?

另外原句that interact very weakly
            with
            matter修饰的是particles

E选变为修饰neutrinos

另外我认为,these无明确指代是因为本句用;与前一句隔开后

一开头就说这些粒子怎么样,可是没人知道是什么粒子啊

有错请指正

请问这里DE these无指代对象就是因为前面是; 从而失去指代对象吗?

同问：DE中these没有明确指代。不理解？？