I’ll pay a visit to the Inner Mongolia ,     there is a large temperature difference     between day and night.

A．in which

B．for which

C．from which

D．of which

罗红霉素中应检查的是( )

A．异常毒性
B．生育酚
C．酮体
D．N,N-二甲基苯胺
E．HPLC