绿化在畜牧场环境控制中有什么作用?
参考答案:
改善场区小气候,净化空气,减少颗粒,减弱噪声,减少空气及水中细菌含量,防疫、防火作用。
—What's the matter with Della?
—Well,her parents wouldn't allow her to go to the party,but she still ________.
A.hopes to
B.hopes so
C.hopes not
D.hopes for
试述结肠癌手术切除的范围?