第六单元知识详解
＊＊＊重要短语
join the Birdwatching Society 加入观鸟协会            Look like 看起来像
one of ... ......之一                                Provide...for...提供......给......
All year round 一年到头                            For a short stay 短暂停留
In the daytime 在白天                              In order to 以便，为的是
Lead to 导致                                     Less and less 越来越少
Invite them to help us 请他们帮助我们                Stop...from doing 阻止做某事
In danger 处于危险之中                            Write down 写下，记下
Be home to 是......的家园                          Be interested in 对......感兴趣
Take part in 参加                                  Call sb.on 给某人电话
Email sb.at 给某人发电子邮件                       Introduce myself 介绍自己

＊＊＊知识详解
一、 How many types of cranes are there in the world? 世界上有多少种鹤？
1. how many 修饰可数名词复数， how much 修饰不可数名词。
2. type 作名词，意思为"种类，类型"，同义词为kind。type作为动词，意思为"打字"。
Are you going to type all day？你准备打一整天字吗？
二、They're rare birds.它们是稀有的鸟类。
rare作形容词，意思为"罕见的，珍贵的"，同义词为unusual.
三、 It is o