题目

（6分）运用你所学的知识，完成下列一组填空：（1）地球上最大的生态系统是生物圈，它的范围包括               、             和岩石圈的表面。（2）植物的根生长最快的部位是根尖的         区；植物吸收水、无机盐的主要部位是根尖的         区。（3）生态系统中的物质和能量就是沿着        和        流动的。________ alone in a dark room, the little girl was so ________ at the ________ sound as to cry in a ________ voice．A.Left…frightened…frightening…frightenedB.Left…frightened…frightening…frighteningC.Leaving…frightened…frightening…frightenedD.Leaving…frightening…frightened…frightening