______属于地下茎类蔬菜。
A.茭白
B.土豆
C.萝卜
D.慈姑
E.藕
参考答案:B,D,E
在细菌鉴定中常用的氨基酸脱羧酶试验有_______、_______和_______。
The boy attached a rope ______ his sled. [ ]
A. at
B. to
C. in
D. with