男性，42岁，劳力性呼吸困难1年，心慌，气短，近1周加重，端坐呼吸。查体心界向左右侧扩大，心率110次／分，心尖区第四心音呈奔马律，无明显杂音，心脏彩超未发现心包积液

该患者心脏超声检查还可能发现（）

A.二尖瓣狭窄

B.二尖瓣关闭不全

C.左右房室均扩大

D.室间隔缺损

E.右心室增大

Assume a firm with a debt to equity ratio of 0.50 and debt equal to $ 35 million makes a commitment to acquire raw materials with a present value of $12 million over the next 3 years. For purposes of analysis the best estimate of the debt to equity ratio should be :（）

A. 0.343.

B. 0.500.

C. 0.671.