His mother will tell him to do his homework _______ he gets home. [ ]

A. as early as

B. as quickly as

C. as soon as

D. as fast as

在盐酸萘乙二胺比色法测定苯胺中，氨基磺酸铵的作用是（）。

A.帮助显色

B.帮助亚硝化

C.帮助重氮化

D.使显色稳定

E.除去过量的NaNO₂