唐朝与各国间的友好往来出现了前所未有的盛况,其原因是
①对外交通发达②唐朝经济文化发达,领先世界③对外推行开放政策④疆域广大[ ]
A.①③④
B.①②③
C.②③④
D.①②④
答案:B
— _______________________
— I'm watching TV. [ ]
A. What did you do?
B. What are you doing?
C. What is he doing?
形势急胀,痛无止时,如有鸡啄,按之中软应指,多为化脓痛。