基本信息
第二部分:知识运用(共两节,满分45分)
第一节 单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. Herbs were ____ base for medicine, and to become _____ doctor, ____ sound knowledge of botany was essential.
A. /; the; a B. the; a; a C. a; the; a D. the; a; /