In today’s fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is ________.
A．essentialB．worthwhileC．challengingD．sufficient
A

試題分析： 句意：在今天的快速變化和有競(jìng)爭(zhēng)力的世界，能夠 學(xué)得更快更有效不僅是值得擁有的，也是基本的。四個(gè)選項(xiàng)的含義分別是：A. essential基本的，B. worthwhile值得的，C. challenging有挑戰(zhàn)的，D. sufficient充分的，選A。
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