The two pictures look the same to me. It's hard to ________ one from the other.[ ]

A. speak

B. say

C. talk

D. tell

静脉滴注，则（）

A.血药浓度波动小

B.血药浓度波动大

C.血药浓度不波动

D.血药浓度高

E.血药浓度低