题目

根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空限填一词。Mr. Smith is a creative teacher who is using a special way to help his students to learn a new lesson. Mr. Smith said, “For part of our lesson today, some of you are going to v【1】 the Lakeside Park to study trees in natural environment. You will look c【2】 and think about the conditions trees need to grow. ”Mr. Smith and some of their students walk to the woodland. There are many beautiful trees there. The students are required to m【3】the trees with the names of three trees b老师讲课时发出的声音是由声带      产生的，同学们听到老师讲课的声音是靠     传播的。