Science and technology have in important ways contributed to the improvement of agricultur

问题补充：

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

答案：

(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。