prep 2-47

liuyuli1992

这道题ron大神在曼哈顿里面也说他觉得A对，因为E里面用了would和之前的will occur结构不合，感觉有点争议啊

下面是Ron的解答
hmm... i like (a) best, but only if it was supposed to say 'it will', and you mis-typed it as 'will it'. if the version you've typed is indeed faithful to the original, then, well, all the choices suck.

reasons:
- 'whether...' and 'what impact...' are parallel.
- the meaning is correct.
- the tenses are parallel: 'will occur' || 'will have'.

choice b:
- the original sentence clearly indicates that scientists don't know whether warming will occur in the first place. this wording, though, assumes that warming will occur; according to this sentence, the only thing in doubt is the extent of such warming.
- 'whether...' is not parallel to 'impact'.

choice c:
- 'as to' is dicey.
- 'or' should be 'and' (because they're wondering about both questions).
- past tense 'did' is inappropriate.

choice d:
- 'or' should be 'and'.
- 'whether...' isn't parallel to 'the impact'.

choice e:
- tense inconsistency: 'will occur' isn't parallel to 'would have'. moreover, 'would have' isn't appropriate for the consequences of something that hasn't even happened yet.

what's the oa?