可以用丹参制剂治疗的疾病中，不正确的是（）

A.冠心病

B.慢性肝炎和肝脾肿大的恢复

C.治疗脑缺性中风

D.治疗消化不良

E.慢性肺心病急性发作期病人

The owner of a firm gathers some information about her business. This year the firm's revenue is $300000. Cash expenses are $170000. Normal profit is $70000. Economic depreciation is $20000. If the owner could have earned $30000 per year in wages working for another company, the firm's economic profit is closest to:（）

A. $10000

B. $30000

C. $60000