— Could you tell me the way to _____ Johnsons, please?

— Sorry, we don't have _____ Johnson here in the village. [ ]

A. the; the

B. the; a

C. /; the

D. the; /

血清甘油三酯酶法的第二步反应是（）。

A.将胆固醇酯用胆固醇酯酶水解掉

B.先用毛地黄皂甘沉淀游离胆固醇

C.用甘油激酶将甘油磷酸化成3-磷酸甘油

D.用脂蛋白脂肪酶水解甘油三酯

E.用有机溶剂抽提纯化脂质