首页 » 知识 » 四年级英语作文：I如何配置一套apk安全监控系统？t is a good friend

　　I have a backpack. It is large and it is blue.

　　It is a birthday gift from my parents. I love it very much.

　　It is very "hard-working", because I keep all my school things in it.

　　It is very heavy.

　　It is with all the time during school days.

　　It is a good friend of mine.

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