A:Cu2++3I-====CuI↓+I2
B:Cu2++2I-====Cu++I2
C:2Cu2++2I-====2Cu++I2
D:2Cu2++4I-====2CuI↓+I2
给下列句子排序,最恰当的一项是 ( ) ①当阳光洒在身上时,它更坚定了心中的信念--要开出:一朵鲜艳的花。 ②不久,它从泥土里探出了小脑袋,渐渐地,种子变成了嫩芽。 ③从此,它变得沉默,只有它知道它在努力,它在默默地汲取土壤中的养料。 ④虽然它经受着黑暗的恐惧,暴雨的侵袭,但是它依然努力地生长着。 ⑤种子在这块土地上的生活并不那么顺利,周围的各种杂草都嘲笑它,排挤它,认为它只是一粒平凡的种子。
Hi, I'm John. I had a good time last Sunday. I went to the nature park with my family, We saw the animals. The animals were so cute. I loved them verymuch. I took many pictures. In the afternoon, we went to the cinema. The film was so fun. Then we went home. My mother cooked good food for me. I was so happy. What about you? What did you do last weekend?
教科书的循环使用有利于保护( )