题目

The experiment shows that proper amounts of exercise, if         regularly, can improve our health． A．being carried out       B．carrying out       C．carried out      D．to carry out 答案：C如图是菜豆幼苗示意图，有关叙述错误的是（ ）A．菜豆幼苗是由种子的胚发育而来的B．[1]是由胚芽发育而来的C．菜豆种子萌发初期所需营养物质来自胚乳D．[3]是由胚根发育而来的