I couldn’t get through the door because there was a big box ______.[ ]

A. by the way

B. on the way

C. out of the way

D. in the way

将下列结构与其相对应的主要功能用直线连接起来：

根            运输有机物、无机盐和水

茎            吸收水分和无机盐

毛细血管            气体交换  

鳃            物质交换