Science and technology have in important ways contributed to the improvement of agricultural production.
A. contributed to
B. resulted from
C. carried off
D. handed over
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(答案→)A. contributed to
B. resulted from
C. carried off
D. handed over
解析： 四个选项分别表示导致、缘自、带走和上交，根据题意选A，科学技术应经在一些重要方面导致了农业生产的提高。