人类及一切陆生生物的“立足点”是 [ ]
A.水圈
B.大气圈
C.岩石圈
D.生物圈
答案:C
My brother was against my suggestion while my sister was ______ it. [ ]
A. in favor of
B. in celebration of
C. in honor of
D. in memory of
闸门按其工作性质可分为()闸门、事故闸门和检修闸门。
A、工作
B、钢
C、木
D、露顶