题目

完形填空。Billy is a boy of fifteen.   His parents died three years ago.  One day when hewas walking in the street，he   1   a wallet. He returned it to the owner, Mr Baker. He gave his   2   to the boy. As the boy had no job, Mr Baker made him work for him in his.  3   Billy worked so hard that Mr and Mrs Baker were   4   with him.Mr Baker loved planting   5   . The week before last, he brought a few trees home, planted them in the   6   himself and watered them every day. Several days   7  , he had to leave for another city. Before he started, he said to Bi下图是某类植物茎的结构模式图，据图回答： （1）图所示是_____________类植物茎的结构，请你写出两种具有这种结构的植物名称：__________________________。 （2）图中3属于_____________组织，它在植物生长过程中的具体作用是____________。 （3）植物生活需要的水和无机盐是由[    ] _____________运输的。