居住区绿地绿地有哪些作用？
参考答案：
1）丰富生活
2）美化环境
3）改善小气候
4）保护环境卫生
5）保持坡地的稳定
I often _____________ books at the weekends, but last weekend I _____________. [ ]
A. reads, did
B. reading, didn't
C. read, didn't
杨玉环本是寿王李瑁的妃子，后明皇召入后宫，并作乐曲送之，该乐曲是？
