They are _______ beautiful flowers _______ many people want to buy them. [ ]

A. as, as

B. so, as

C. so, that

D. such, that

许某，59岁，近日来大便发黑，怀疑有消化道出血，医嘱给予大便隐血试验。

该病人应在试验前几天控制饮食

A．1天

B．2天

C．3天

D．4天

E．5天