河北省怀抱京、津,交通便和,下列铁路都经过河北省的一组是 [ ]
A.京九线、京沪线、大秦线
B.京包线、陇海线、京哈线
C.京广线、焦柳线、京哈线
D.宝成线、沪杭线、京通线
答案:A
“Goodbye, then”, she said, without even ________ from her book.[ ]
A.looking down
B.looking up
C.looking away
D.looking on
简述我国宪法规定的公民的基本义务。