在短期内，厂商所面临的资本供给曲线是（）
A.向右上方倾斜
B.向右下方倾斜
C.完全无弹性
D.完全有弹性
参考答案：C
简述原果胶、果胶和果胶酸的区别？
What should I _________ to him? He is very angry with me. [ ]
A. tell
B. say
C. talk
D. speak
