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.

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想问一下这道题怎么理解？

关于平行比较，前三句是一个问题，我不太明白这个比较后面的did/is的位置，为何有的放在代词前有的在代词后？比如前两句，did可否放在those are后面？ 最后那句话是否平行呢，that of course可都指代social structure，谢谢 此外，还有句i have more apples than eric‘s apples这句宾语比较是否正确呢？

语法！老师，我想问一下，这几个的区别 Taste buds are xxx，each of them has x. 是错的，each of them has x 这里是一个单独的句子 Taste buds are xxx，each of which has xxx.对了，each这个句子是定语从句吗？还是同位语从句？ Taste buds are xxx，each has…跟each of them has ……是一样的吗 Taste buds are xxx，each having…是同位语修饰吗

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请问may老师此题思路

请问may老师此题思路

请问may老师此题思路

请问may老师此题思路

请问may老师此题思路