參考答案

　　第二部分:

　　21-23：CCD, 24-27. BACA 28-31. CDBA 32-35. ACDD

　　36-40CEGAF

　　第三部分:

　　41-45：BCAAC, 46-50：DBCDA, 51-55：DCCBD, 56-60：ABADB

　　61. who 62.retired 63.realising/realizing 64.warmth 65.younger

　　66.that 67.as 68.is considered 69.goes 70.works

　　第四部分：第一節(jié)：

　　第二節(jié) :

　　Dear Sir,

　　I’m Li Hua, a student from Guangming middle school. I’m writing to express my opinions about the shared bike.

　　Being convenient and environmentally friendly, shared bikes have already been popular throughout China. However, with its rapid development, it brings about many problems. In some places shared bikes are left everywhere and sidewalks are occupied. What’s worse, some people even damage them or take them just as their own possessions.

　　In my opinion, it’s the lack of public awareness and related laws that results in such phenomena. To solve the problems, measures must be taken right away. First, the government should make some strict laws and rules to regulate the operation and management of the shared bikes. Second, the public should raise their awareness of using the bikes correctly and gracefully.

　　I hope you will take my advice into consideration.

　　Yours sincerely,

　　Li Hua