题目

The way people hold to the belief that a fun - filled, pain free life equals happiness actually reduces their chances of ever attaining real happiness. If fun and pleasure are equal to happiness then pain must be equal to unhappiness. But in fact, the opposite is true: more often than not things that lead to happiness involve some pain. As a result, many people avoid the very attempts that are the source of true happiness. They fear the pain inevitably(不可避免的)brought by such things as marriage, raising children, professional achievement, religious commitment (义务), self - improveme夏季大雨过后，常常看到蚯蚓爬到地面上，出现这一现象的原因是（ ）A．水占据了蚯蚓的生存空间B．湿土太重，蚯蚓承受不了湿土的压力C．土壤浸水后缺少空气，蚯蚓得不到足够的氧气，爬到地面上，以便获得更多的氧气D．蚯蚓喜欢雨后晒太阳