从下列药物中选出治疗耐甲氧西林金黄色葡萄球菌感染最为有效的药物（）。

A.三代头孢菌素

B.二代头孢菌素

C.半合成青霉素

D.碳氢酶烯类抗生素

E.糖肽类抗生素

In a CFA study seminar, the following comments were made: Comment 1: "In the short run, an increase in demand in a perfectly competitive industry will result in negative economic profit for some firms in the industry. " Comment 2: "In the long run, a permanent increase in demand in a perfectly competitive industry will result in zero economic profit for the firms in the industry. " Which of the following best describes the accuracy of these commentsComment 1 Comment 2（）①A. Correct Correct ②B. Correct Incorrect ③C. IncorrectCorrect

A. ①

B. ②

C. ③