When people engage in activities that help others, their brain releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. It has been suggested that regular release of endorphins increases people’s longevity. And a statistic on adults who regularly engage in volunteer work helping others shows that they live longer, on average, than adults who do not volunteer. However, that statistic would be what we would expect even if volunteering does not boost longevity, because___________ Which of the following most logically completes the argument? A In the communities studied, women were much more likely to do regular volunteer work than men were, and women tend to live longer than men do B The number of young adults who do regular volunteer work is on the increase C The feelings of well-being induced by endorphins can, at least for a time, mask the symptoms of various conditions and diseases, provided the symptoms are mild D It is rare for a person to keep up a regular schedule of volunteer work throughout his or her life E Some people find that keeping a commitment to do regular volunteer work becomes a source of stress in their lives 错选了C，答案给的A。A说女士比男士更可能做志愿活动，女士比男士活得长。这不是支持原文了么？可以题目不是应该驳斥吗？

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！