扦插就是把切下的枝条(或者根、叶)插进土里，使枝条生成一个完整的植株。()

According to the text, an emotional person______ .A．thinks little before making a great decisionB．depends on his impulse to make a decisionC．worries endlessly no matter what he doesD．normally feels a strong sense of pleasure 点击查看答案

胚由受精卵发育而成，是新生植物的雏体，由胚根、胚芽、胚轴、子叶四部分构成。() 点击查看答案&解析