“$x>3$”是“$x^2>4$”的（　　　）

⑴Do you want some rice?____             A. Thanks.

⑵What do you want to drink?____       B. Yes, I do.

⑶Can I help you?  ____                         C. I want some bread.

⑷Here you are.____                               D. Water, please.

⑸Do you want coffee or tea?____         E. I want some tea, please.  

文中一再写到“一片混乱”“乱得不可开交”，怎样理解作者的用意？请说说你的看法。

下列水体中自净能力最强的是(　　)