I still see her _____________ after our graduation from college.
A:now and then
B:by and by
C:step by step
D:more or less
“庄稼一枝花,全靠肥当家”.下列物质可作为氮肥的是( )
花生种子中含有较多的脂肪和蛋白质,萌发时能分解为氨基酸的物质
在平面直角坐标系中,△ABC三个顶点的位置如图(每个小正方形的边长均为1).