The old man has two sons, ____ are lawyers
A. both of them
B. both of who
C. both of whom
D. both of they
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He is a man of great knowledge, ____ much can be learned
A. in whom
B. about whom
C. from whom
D. of whom
Do you know the man ____ just now?
A. to who I nodded
B. I nodded to
C. whom I nodded
D. whom I nodded to him
以下食品种类中,受伏马菌素污染最严重的是()。
A. 奶制品
B. 水产食品
C. 谷物类食品
D. 肉制品
下列关于猪链球菌的说法中,正确的是()。
A. 它是一个条件致病菌
B. 侵染猪时它要求高温高湿的环境
C. 它只在猪之间传染,不会感染人
D. 猪群对于猪链球菌的带菌率高,但不一定发病
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