国学大师王国维把“昨夜西风凋碧树。独上高楼，望尽天涯路。”“衣带渐宽终不悔，为伊消得人憔悴。”“众里寻他千百度，蓦然回首，那人却在，灯火阑珊处。”这三句词喻作为古今成就大事业大学问必经的三种境界，并赋予了全新含义：他认为第一种境界是站得高、看得远、立下宏伟志向；第二种境界是要为了自己的志向而努力，即使衣带渐宽也终不悔；第三种境界是坚持自己的理想，要耐得住（）淡泊。

A.寂寞

B.艰辛

C.挫断

D.孤独

Consider the following statements: Statement 1: "The sum of consumer and producer surpluses is maximized under both monopoly and perfect competition. " Statement 2: "All else being equal, a monopolist that practices price discrimination will be more allocatively efficient than a single-price monopolist. " Which of the following best describes the accuracy of these statements Statement 1 Statement 2 （）①A. Incorrect Correct ②B. Correct Correct ③C. Correct Incorrect

A. ①

B. ②

C. ③