搜过，无大全-补充-229：
229. New hardy varieties of rice show promise of producing high yields without the costly requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties.
(A) requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties
(B) requirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation
(C) requirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties
(D) application of commercial fertilizer and irrigation that was required by earlier high-yielding varieties（E）
(E) irrigation and application of commercial fertilizer that were required by earlier high-yielding varieties
In E, required修饰what, why C is not correct?
thanks, NN!
128. New hardy varieties of rice show promise of producing high yields without the costly requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties.
(A) requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties
(B) requirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation
(C) requirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties
(D) application of commercial fertilizer and irrigation that was required by earlier high-yielding varieties（E）
(E) irrigation and application of commercial fertilizer that were required by earlier high-yielding varieties
Choice E, the best answer, clearly and grammatically expresses the idea that two costly procedures, irrigation and the application of... fertilizer, were required by earlier high-yielding varieties of rice. In A, the placement of by earlier... varieties immediately after application of fertilizer suggests that the varieties applied the fertilizer. In B and D, the phrase application of... fertilizer and irrigation is ambiguous in meaning: it cannot be clearly determined whether applying fertilizer and irrigating are a single operation or two distinct operations. In C, only irrigation—not both irrigation and fertilization—is clearly associated with the earlier... varieties of rice.
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