一、第一节1-5 ACACA 6—7 BB

　　第二节8.They visited the city garden.  9.Under a big tree./They enjoyed a picnic  lunch under a big tree.   10.The importance of trees for the environment.

　　第三节 A.more   B.100/one hundred   C.roots    D.carry     E.strong

　　二、第一节11-15 ABBBC 16—20 DCCBA

　　第二节21—25 ABBCA 26—30 ABDBD三、31—35 BACDB 36—40 CADAB

　　四、第一节41—45 DCAAB 46—50 BBDCA

　　第二节51—55 BDECA

　　五、第一节56.create 57.environment 58.oxygen 59.products 60.dig

　　第二节61.is introducing    62.To begin with/First of all    63.is made from    64.it'svery important/it is important;plant    65.call on

　　第三节

　　Dear Elaine,

　　I am glad that you are interested in kapok tree.It is a type of commonly seen tree inGuangzhou.An adult kapok tree is very tall with a straight trunk.It can reach 25 metres in height.Its branches spread and its green leaves provide a good shade for people.In spring,the big redflowers of kapok trees always catch my eyes when I walk along the streets.

　　People in Guangzhou have long been growing kapok trees,using their cotton to make clothesand their flowers to make herbal tea.Their tree bark and roots are also used as Chinese medicines.I love kapok trees.I think they are not only beautiful but also useful.When you come toGuangzhou next time,you can have a good look at these amazing trees!

　　Best wishes,

　　Li Hua