一般所说的拨号入网，是指通过（）与因特网服务器连接。
A、微波
B、公用电话系统
C、专用电缆
D、电视线路
参考答案：B
– Do you know why the river was polluted?
-- Many different factors ___________ the serious pollution of the river.
A．contributed to
B．adjusted to
C．were accustomed to
D．were attached to
肺胀的病理因素，主要责之于（）
A.肺肾两虚，气失摄纳
B.心肾阳虚，水气凌心
C.痰浊水饮与血瘀互为影响，兼见同病
D.痰气交阻，伤及肺脾肾，本虚标实
E.阴盛阳微，本虚标实
