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6 Android服务分为哪两种，从提供者的角度？
A．网络服务
B．自定义服务
C．硬件服务
D．系统服务
单项选择题
According to the writer, what is causing the 'torment of e-mail' (ParA.5) described in reports?A.The persistence of advertisers.B.Problems caused by computer viruses.C.The attitude of those receiving e-malls.D.Lessons learnt from dealing with junk mall.
A.5)
B.The
C.
B.Problems
D.
C.The
E.
D.Lessons
F.
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