1 often take a bus to school, but I go to school by bike.
A:some time
B:sometime
C:some times
D:sometimes
如图是隋朝运河图,请在图中方框内填出相应的地名。(填古地名)
当x>0时,函数y=x2+2x+4x的最小值为____
属于我国内海的是( )