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.

请郭老师 帮我说下 家族企业 开饭馆那个话题卡 串到朋友研究菜谱 这个话题卡 谢谢

请郭老师说下捉迷藏的话题卡 谢谢 我词穷

请郭老师串话题卡 谢谢

请郭老师帮我编个三层手工蛋糕的 雅思口语 谢谢

请郭老师帮我编一段 教别人瑜伽或者游泳的口语 我词穷 实在编不出来 谢谢

请郭老师帮我编一段饭馆感受差的口语 我词穷 谢谢

小郭老师 描述类太多 分成了两个问题（描述类1）

小郭老师 描述类太多 分成了两个问题（描述类1）

小郭老师…描述类2 接1

请问郭老师。这是雅思口语考试事件类的考题 麻烦老师帮我想想我怎么能串起来 太多了