第七单元：第一题1,A2a3c4b5b6c7c8d9c第二题10628trees change a lot when they grow＆＃92；the growing of trees ＆＃92；the development of trees ＆＃92；the life of trees．2,catch enough sunlight3,face challenges in life4, 155, becoming real adults参考资料：答案
第七单元：第一题1,A2a3c4b5b6c7c8d9c第二题10628trees change a lot when they grow＆＃92；the growing of trees ＆＃92；the development of trees ＆＃92；the life of trees．2,catch enough sunlight3,face challenges in life4, 155, becoming real adults参考资料：答案