下列跨流域调水工程中，可解决唐山市缺水的措施是[ ]
A．引滦入津
B．引滦入唐
C．引黄入晋
D．南水北调
答案：B
His father made him _____ homework first. [ ]
A. to do
B. do
C. doing
D. is doing
奠定了曹操统一北方的基础的战役是[ ]
A、巨鹿之战
B、长平之战
C、官渡之战
D、赤壁之战
