For Questions 16 through 20, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

填空题 With its rebellious approach to the subject, her book has been more widely debated than most; throughout the country, the media have brought the author's ______ opinions to the public's attention. A. authoritative B. popular C. controversial D. articulate E. conclusive F. polemical

填空题 Judged by almost any standard, the seahorse remains one of nature's more ______ creatures, with the male of the species giving birth to offspring. A. unique B. feckless C. novel D. lackluster E. industrious F. mettlesome

填空题 After numerous rejections, the actress was ______, certain that she would never act in a Broadway play. A. speculative B. optimistic C. despondent D. resilient E. insipid F. melancholy

填空题 After a slump in sales, the board of directors decided to ______ with another corporation, forming one of the largest conglomerates in the country. A. unite B. capitulate C. dissipate D. merge E. alternate F. disperse

填空题 The topic of teaching evolution in schools, still a rather ______ issue, has been a subject of debate for years. A. ephemeral B. controversial C. abbreviated D. contentious E. inexplicable F. settled