通货膨胀的实质是______大于______。
参考答案：社会总需求 社会总供给
某林场去年种植了10000棵树苗，年底抽查了其中的1000棵，死亡的棵数占2%．这批树苗成活的棵数占种植总数的（ ）
A．20%
B．80%
C．2%
D．98%
I often go to the English corner to have a free talk with my classmates ________I am busy. [ ]
A. except that
B. except for
C. except in
D. except
