A：c(H＋)
B：K(HF)
C：
D：
江南最大的天然湿地﹣﹣下渚湖，河水清澈，水草丰腴，白鹭点点，形成了独特的湿地景观．
(____) No, I don't like winter.
(____) Which season do you like best, Lily?
(____) Winter. I can play with snow.
(____) So I like autumn best. It's always sunny and cool.
(____) What about you? Do you like winter, too?
(____) It's too cold.
命题“∀x∈R，x3﹣x2+1≤0”的否定是（ ）
下列供热方式，最有利于环境保护的是（ ）
