江南水乡以河成街，街桥相连。读江南水乡景观图，回答问题。
请运用所学地理知识分析上述景观的形成原因。
亚热带季风气候，降水量较丰富；地处平原，地势低平；河网密集（或河流众多）；居民傍水而居，水运便利、用水方便。
读图，完成下面问题，图中①表示的基本地形类型是（ ）
用should或shouldn’t填空，完成下列句子。
You ____ walk in the corridor. You ____ run.
You ____ talk in class. You ____ listen to the teacher carefully.
You ____ push your classmates. You ____ be kind to them.
You ____ be noisy or run in the swimming pool. You ____ line up.
You ____ always listen to the older people. You ____ talk loudly.
①NO ②N2O4 ③HNO3 ④NH3
