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?
