We go to the theatre _______ Saturday or Sunday. [ ]
A. in
B. on
C. at
D. with
答案:B
It can not be used before()
A.inspect
B.insoected
C.being inspected
D.inspecting
用超速离心法可将血浆脂蛋白分为乳糜微粒、前β-脂蛋白、β-脂蛋白和α-脂蛋白。