An analyst identifies the following cash flows for an average-risk project: Year 0 - $ 5000 Years 1-2 $ 1900 Year 3 $ 2500 Year 4 $ 2000 The project’s discounted payback period if the company’s cost of capital is 12% , and internal rate of return of the project, are closest to: Discounted payback periodIRR （）

A. 3.0 years           13.3%

B. 3.0 years           23.2%

C. 3.9 years           13.3%

患者女性50岁，左腮腺区反复肿胀三年，平时有胀感，口内有咸味。

较符合慢性阻塞性腮腺炎的病史是

A．无自觉症状

B．肿胀消长与进食有关

C．腮腺区有枣样大小肿物

D．耳前放射痛

E．患者面颊麻木