固定成本具有的特征是()。
A.固定成本总额的不变性
B.单位固定成本的反比例变动性
C.固定成本总额的正比例变动性
D.单位固定成本的不变性
E.固定成本总额变动性
参考答案:A, B
The movie is so__________, and many of us are ____________ in it.
A.interesting; interested
B.interesting; interesting
C.interested; interested
D.interested; interesting
My sister looked _ because she lost her ID card. [ ]
A. worry
B. worrying
C. worried