这道题正确答案是 B， 我一直觉得是D, 不是特别明白 B 答案为什么 说as effectively as sea snakes can? One such adaptation is the closer proximity of the terrestrial snake's heart to its head, which helps to ensure circulation to the brain, regardless of the snake's orientation in space. The heart of sea snakes can be located near the middle of the body, a position that minimizes the work entailed in circulating blood to both extremities. In arboreal snakes, however, which dwell in trees and often assume a vertical posture, the average distance from the heart to the head can be as little as 15 percent of overall body length. Such a location requires that blood circulated to the tail of the snake travel a greater distance back to the heart, a problem solved by another adaptation. 20. It can be inferred from the passage that which of the following is true of species of terrestrial snakes that often need to assume a vertical posture? (A) They are more likely to be susceptible to circulatory failure in vertical postures than are sea snakes. (B) Their hearts are less likely to be located at the midpoint of their bodies than is the case with sea snakes. (c) they cannot counteract the pooling of blood in lower regions of their bodies as effectively as sea snakes can. (d) the blood pressure at their midpoint decreases significantly when they are titled with their heads up.

请英吉老师看一下我这道作文题的找错和论证有什么不足，谢谢！

麻烦唐瑭老师讲解一下这道题的做题思路 谢谢～

麻烦唐瑭老师讲解一下 这道题AC选项以及为什么定位最后一句可以的到A 谢谢～

麻烦金老师讲一下这题C选项，分号后面的句子中is算不算谓语？ 再麻烦老师讲一下这句话意思 谢谢～

麻烦老师分析一下这道bf题 谢谢～

请老师解答一下这个ir题，感觉像加速度有关的物理题，但我忘记公式了

请老师在纸上写一下这道题的过程，谢谢！

英吉老师您好，请问您能够给我解读一下这篇阅读吗？谢谢@英吉

May老师好…117题是一道机经题…请问E为什么不可以。谢谢！

麻烦老师从头到尾讲下这个题，也不太明白为啥CD的choose sb for heading不行，以及C选项的as为啥不行，我记得语法课上讲as是=，在这个题里面Meri…这个人也可以等于这次expedition的head啊，是不是我as的理解有问题，麻烦您详细纠正/指点下，谢谢