问几道prep语法题。。。。

liujin

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

选A

这题为什么D错啊？these不可以指代划线句前面的neutrinos?

选哪个是比出来的。A的语义明显说的比D清楚。
GMAT语法考的是：语义表达的精确度。
也就是说，作为商业精英，你说的话，对方能不能听懂。

(D) these harmless elementary particles are produced in nuclear reactions, and neutrinos
这里面，谁知道these harmless elementary particles 是什么，还得让听你说话的人回想一下？
我怎么知道these harmless elementary particles 和neutrinos 什么关系？表义不清楚！

假如我叫小明，这个感觉就好像在说：
我在写作业，小明是个努力的孩子。

liujin

The continental United States receives an average of 30 inches of precipitation a year; transpiration from soil and from plants returns approximately 21 of the 30 inches to the atmosphere, while the balance of 9 inches contributes to the flow of streams and rivers.

(A) transpiration from soil and from plants returns approximately 21 of the 30 inches to the atmosphere, while the balance of 9 inches contributes to the flow
(B) even though transpiration from soil and from plants returns approximately 21 of the 30 inches to the atmosphere, the remainder of 9 inches contribute to the flowing
(C) although transpiration from soil and from plants return approximately 21 of the 30 inches to the atmosphere, the balance of 9 inches contribute to the flowing
(D) with transpiration from soil and from plants to return approximately 21 inches to the atmosphere, the rest of the 9 inches contributes to the flow
(E) as transpiration from soil and from plants return approximately 21 of the 30 inches to the atmosphere, the rest of the 9 inches contribute to the flow

选A
D错，是因为没有表现出对比？

(D) with transpiration from soil and from plants to return approximately 21 inches to the atmosphere, the rest of the 9 inches contributes to the flow

D有很多错误，选一个最简单的就可以把它排除。
the rest 就是指剩下的那9 inches。
而the rest of the 9 inches 指的是，9 inches里剩下的，明显不对。

不需要把每个选项都看得那么透，只要找到明显的语义错误就可以立即排除。

SC考察的是“语义的精确度”，就是你的意思到底有没有说得清楚明白，没有歧义，如果简洁就更好了。