19. In today's fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is   .

A. essential     B. worthwhile

C. challenging     D. sufficient

19. A考查形容詞辨析。句意:在今天這個快速變化和有競爭力的世界中,能夠學得更快、更有效不僅是可取的,也是基本的。essential基本的;worthwhile值得的;challenging有挑戰(zhàn)的;sufficient充分的。選A。

題目來源:2015全品語法快練高中英語新課標 > 訓練6 介詞、形容詞、副詞、動詞及詞組

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