问题补充：
The scientist much of his time to increasing the rice production.
A. spent
B. offered
C. devoted
D. paid
答案：
A. spent
B. offered
(答案→)C. devoted
D. paid
解析：考查动词辨析，A. spent花费，sb spend+time/money (in) doing sth注意主语是人B. offered提供，offer sb sth意思“提供某人某物”C. devoted贡献，sb devote time/money to doing sth注意to后面跟动名词D. Paid花费It paid sb time/money to do sth，所以选C
