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?qū)W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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