—Nowadays the doctors are trying their best to reduce the people’s fear__________ they would be affected by the present disease called “Bird Flu （禽流感）”.

A．whether

B．which

C．that

D．when

有关禽流感病毒的描述，错误的是（）

A.属甲型流感病毒

B.可分为高致病性、低致病性和非致病性

C.只有某些亚型对人类致病

D.感染H5N1的患者病情较轻

E.耐低温