Science and technology have in important ways the improvement of agricultural production.

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(答案→)A. contributed to
B. resulted from
C. carried off
D. handed over
解析：这题考查词组辨析：contributed to导致，resulted from源于，carried off夺走， handed over交付，句意是：科技在一些重要的方面有助于农产品的改善。选A。