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.

A选项D选项动作发出者分别是什么A为什么不对 这个题能帮忙分析一下吗

请数学老师解答一下 谢谢 答案是星期四十点 我只能算出星期四12点

老师，对于这题ABC的their还有DE的they.他们指代有没有问题呢，就近的话我可以理解成指代records吗The loan company announced it would soon lend money to borrowers with proven records of their not paying back their loans on time,collectively known as subprime lending market. A.of their not paying back their loans on time B.of not paying back their loans on time, a group C.of not paying back their loans on time,with such a group D.that they do not pay back their loans on time. E.that they do not pay back their loans on time,such a group

图片里的并列不是很明白，还得麻烦老师帮忙将一下谢谢，此外， 下面这and连接的并列，不考虑语义，前面是过去分词，后面是it+过去分词这种属于并列吗？brightened the Northern Lights and it possibly knocked

本题是og19、sc720题，答疑器搜不出来，有如下疑问，谢谢老师 ①A选项不太明白， ②so as to 有没有这种说法？ ③D选项的enough和so as to能连用吗 ④E选项的so much as to有这种说法吗

希望金老师回答，这个题D选项有两个because怎么翻译整个句子呢？

老师，我记得所有质数里面只有2一个质数吧？不过答案还是-2，对吧？

张老师您好，这篇文章这道题目我不是很理解。第一句话说some historians认为during世界大战，unions和African A的关系是strong alliance，结束以后就没有了；第二句话说other scholars认为这些unions（organizd labor)一直都在帮助AA，可是并没有提到他们两者在二战之中的关系，所以不太懂为什么选C？老师您能不能说一下您的解题思路以及我思维上的一些问题？谢谢！

老师 这道题目不会做，我不理解为什么有3个男生，3个男生的位置都可以变，所以应该A33*A33，答案是A22，不懂求解

老师，这种题目有重复的字母我经常会有点混淆，我一般用的方法就是6C1*5C2*3C3，就是假设一共有6个空位，字母a选一个位置，还剩5个位置给b选两个位置，请问这种思路对吗？还有答案里的思路，我旁边注释的思路对嘛？求老师指教这类题目好的解题方法，谢谢！