To have a computer without being connected to the Web is like having an old radio when everybody else has a color TV. That helps explain ______ businesses are setting up Net sites even though profits are nowhere to see.

A．reasons

B．the reason for

C．why

D．why that

黄曲霉素AFTB₁（如图）是污染粮食的真菌霉素。人类的特殊基因在黄曲霉素的作用下会发生突变，有转变成肝癌的可能性。与1 mol黄曲霉素起反应的H₂或NaOH的最大量分别是

A.6 mol,2 mol

B.7 mol,2 mol

C.6 mol,1 mol

D.7 mol,1 mol