A:①②
B:②③
C:③④
D:①④
My teacher promised to ______ my suggestions, so I gave him some ______.
在某段公路上,分别有图示的甲、乙两块告示牌,告示牌.甲上面数字的意思是指____,乙上面数字的意思是指____.
下列有关人体运动的说法,正确的是( )