问题
单项选择题
The short-run supply curve for a purely competitive market:（）
A. slopes upward to the right.
B. slopes downward to the right.
C. is a horizontal line.
答案
参考答案：A
解析：
The short-run supply curve for a purely competitive market slopes upward to the right. This reflects the fact that firms in the industry will produce more when the price rises.