目前，我国工程造价咨询单位的资质等级划分为（）等级。
A.5个
B.3个
C.2个
D.4个
参考答案：C
欢呼雀跃huān hū què yuè
If the market demand for a product increases in a competitive market, then in the short run the quantity supplied by an individual firm will:（）
A. decrease and the firm will generate economic profits.
B. increase and the firm will generate economic profits.
C. increase and the firm will generate economic losses.
