(2012·南京高二检测) Some people are worrying about the possibility _______ mobile phones could be responsible for a range of illnesses, from rashes (皮疹) to brain tumors.

A．that

B．why

C．how

D．whether

艾滋病是由___________引起的，该病毒主要侵犯__________使机体__________功能部分或完全丧失，继而发生__________、__________等。