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题库 / GMATAdvanced-CR-27
The retinas of premature babies are not fully developed at birth. Because their retinas are so delicate, premature babies sometimes lose their sight. Methods for preventing this syndrome, which is called retinopathy of prematurity, have improved, but the proportion of premature babies who lose their sight because of this syndrome has increased.
Which of the following, if true, best reconciles the apparent discrepancy described above?
When premature babies are born, their retinas are developmentally unprepared to deal with light and air in the environment outside the womb.
The oxygen that must be administered to premature babies at birth can sometimes have a damaging effect on the babies’ retinas, but the oxygen is now administered in less damaging concentrations than it used to be.
The effects of retinopathy of prematurity can be reduced by controlling the exposure of premature babies to light and oxygen, but this method cannot completely prevent the syndrome.
The improvement of methods to prevent retinopathy of prematurity has been a gradual process, and there is still a need for further knowledge.
Improved medical technology is saving the lives of premature babies who would previously have died, but these babies have even more delicate retinas than do other premature babies and are more apt to lose their sight.
原文：为什么 【技术tech】↑，但是【retinas视网膜不好的人数↑】？
E ：这些【技术tech】只是为了拯救那些本来会因此失去生命的宝宝，但是这些宝宝更脆弱in retinas。
所以，技术↑，活下来的↑，
但是活下来不等于治好了，依旧在retinas有问题，所以【retinas视网膜不好的人数↑】
注意：C没有讲【技术tech】，只讲了【retinas视网膜不好的人数↑】。
原文：早产儿，由于视网膜未发育完全，在出生时有时会失明。虽然预防早产儿失明的方法有所改进，但早产儿失明的比例还是增加了
题干：调和以上陈述的问题 ---- 方法改进了，失明比例却在增高
A：只是解释了为什么早产儿会失明
B：给氧气是造成失明的原因，但现在氧气浓度不足以造成失明了
C：光和氧气可控，但无法完全杜绝失明 （有一点点关系了，但还是没说明失明比例上涨原因）
D：方法还需要进一步改善
E：改进的医学技术只是让以前会死的早产儿活下来，但这些早产儿的视网膜比以前能自己活下来的早产儿的更易碎，更容易失明
打错了 早产儿=死+没死 是➕
早产儿=死=没死
没死👉失明 死👉不统计
失明早产儿比例🔝=没死失明/新生儿（1）
选项E：1⃣️没死增多 即 失明早产儿增多2⃣️（1）式分子变大
这么短时间内确实很难反应得过来，E得绕一圈。。。找他因：题目——有了新的治疗方法，R的患病婴儿反而增加了。。。原因：技术进步救活了很多本来无法存活的婴儿，这部分婴儿的R本来就更加脆弱，所以患R的人就增加了
个人觉得楼上说的不对， 答案的意思是说 原来会死亡的婴儿都能救回来了，但是他们的视网膜出现问题的概率会很大，因为用了新的technology
我的想法，简单来说就是以前生的早产儿可能是八九个月的，retina假设发育了80%；现在医疗技术进步了，五六个月的早产儿都能活下来，他们的retina只发育了40%，早产儿中更弱的比例变大了，就算Methods for preventing this syndrome提升了，也无力阻止这些太弱的孩子眼睛出问题。
感觉是一个数学问题 b/a这个rate变大了 是因为这个比例变成了b+1/a+1
Among the ROP cases that currently occur, a significant number of them are more severe than in the past. This is an indirect result of the increased survival rate of premature babies, which is also due to technological advances. The greater severity of the ROP among those babies who have it could easily explain the greater proportion of ROP cases that lead to blindness.