心肌的特性有哪些？
参考答案：
心肌有以下四个特性：⑴自动节律性；⑵传导性；⑶兴奋性；⑷收缩性。
什么是经纪人？
根据汉语提示完成句子。
1. ______ (自信的) people aren't afraid to speak in public.
2. She taught (她自己) English.
3. Don't __ _ (打扰) others when they are doing something.
4. The boy is not tall enough to reach the books on the ___ _ (书架).
5. Mr Wang is really (有帮助的). He is always ready to offer a helping hand.
