近年来,酶制剂的来源主要依靠( ) A . 从动物的内脏中提取 B . 从植物的茎叶果中提取 C . 微生物发酵技术制取 D . 通过生物的光合作用制取 答案:CExcuse me, but can you tell me ________?
A. where can I get to the library
B. where I can get to the library
C. how can I get to the library
D. how I can get to the library