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

下列哪项不是病毒性肝炎对妊娠的影响？（）

A.早孕反应严重

B.易加重母体病情

C.易发生产后出血

D.易发生胎盘早剥

E.新生儿易感染病毒性肝炎