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manass wrote:
If we dont know the number of people in that community (it can be 2 also) why cant we eliminate both among and between.
I picked E need more help
Actually, you can pick among here because we can assume that the community is large. We are not talking about any hypothetical community. We know for a fact that scientific community is more than two people.
Anyways, here is the official explanation from Manhattan :
(1) Take a First Glance (5 seconds)
The initial four-way split (among, between, within, in) is testing Idioms.
(2) Read for Meaning
The sentence says that there is disagreement among the scientific community about why people yawn. The difference between among and between is that between can only be used when discussing two things (between apples and oranges); among is used when discussing more than two things (among his peers). Since there are presumably more than two people in the scientific community, between the scientific community is incorrect. Eliminate choice (C). Note that in the scientific community and within the scientific community are also both correct idioms, but if you’re ever uncertain of the proper idiom, tackle the other splits first.
Some research suggests one explanation for the phenomenon of yawning: Yawning increases blood flow and cools the brain. Most readers will likely not hear a mistake in the initial sentence. When this happens, compare the remaining answer choices to see whether they can shed light on a possible mistake in the original sentence.
(3) Find a Starting Point
Start with any difference that seems easiest to you, then move to the next easiest issue, and so on. Stop when you have one answer or you aren’t sure how to address the remaining differences. All errors for each choice are detailed in the next section.
(4) Eliminate (and Repeat)
(A) Notice that answer choice (B) changes the reason is … because to the reason … that. The structure the reason … because may sound fine, but it’s actually redundant: the reason already indicates that you’re about to hear a causal explanation; because conveys the same idea.
(B) CORRECT. This sentence changes the reason is … because in the initial sentence to the reason … that, removing the redundancy. Both and cools and cooling are correct; this split is a red herring.
(C) Between cannot be used to refer to the scientific community, which has more than two members.
(D) By removing reason, this sentence fixes the redundancy in the original sentence. However, the new construction introduces a modifier error. The modifier by doing so (yawning) must be followed by whoever is doing the yawning. For example, by exercising, Jim stays healthy. Jim is the person exercising. You could not say by exercising, a low heart rate keeps Jim healthy. This illogically implies that the low heart rate is doing the exercising. In answer choice (D), by doing so (yawning), blood flow implies that the blood flow is yawning.
(E) The reason … because is redundant. The reason already indicates that you’re about to hear a causal explanation; because conveys the same idea.