To help deal with public fascination -- and sometimes undue alarm -- about possible threats from asteroids, astronomers have adopted a scale that rates the likelihood that a particular asteroid or comet will collide with Earth.
ETS真会耍花招!! 不愧是ETS!
Responding to the public’s fascination with-and sometimes undue alarm over-possible threats from asteroids, astronomers have developed a scale for rating the likelihood that a particular asteroid or comet will collide with Earth.
这两个句子完全不同. 和楼上MM 说的一样
如果加for 就成了a scale 专门用来rating...的. 意思不好
还有12楼的二郎神同学说的对, 这是倒装.
给大家两个Nytimes 的例子:
1. I wonder how easy it will be to tell that these puzzles come from true veterans
2. Ben S. Bernanke’s biggest challenge will be to undo much of what made him a hero during his first term.
摘录如下: (d) is the best answer, although (c) is not too far behind.
关于C的解释:
i can see that (c) is unacceptably informal / casual, and maybe even unidiomatic, but i can only see that because i'm a seasoned writer and reader of formal english.
for those of you who are not native speakers of english - the best approach to problems such as this one is: * note the differences in usage between the formal and informal - e.g., "rate how likely" vs. "rate the likelihood that..." * remember what these differences look like, so that you can make similar distinctions in the future.
关于E的解释
(e) is wrong, since you can't use both "likelihood" and "may"... redundancy. shri312 wrote: Ron, Doesn't answer Choice " E "states the scale itself rates the likelihood of a asteroid? yes, that's another problem -- an asteroid itself doesn't have a "likelihood". good find. i.e., only EVENTS have a "likelihood". an asteroid is a physical object, not an event, so it makes no sense to speak of its "likelihood". --------------------------------------------------------------------
另一个老师关于scale to rate 还是scale for rating的解释:
hello could you please explain whether phrase 'developed a scale for rating ' is correct . I thought correct choice of words would be 'developed a scale to rate ' thanks in advance
It's because the author intends the purpose (rate something) to be more closely related to the scale than the development process. It's a "scale for rating"; either one can be used correctly depending on the author's preference.  lease keep in mind that just because one answer choice is correct doesn't mean that EVERYTHING that's different about another choice is wrong. Sometimes the GMAT tosses out a split that just doesn't matter (although this is far less common than splits that matter)..