An analyst doesresearch about closely-held companies. With respect to valuation of closely-held companies, the most appropriate base for estimating a discount for lack of liquidity is the:（）

A. market price of a similar but actively publicly traded company.

B. Estimate of the value of equitywith all control rights.

C. mean value of the company's transaction prices recently.

慢性肾小球病变时，肾皮质回声常明显增强，应选用哪一脏器的回声与肾皮质对比最佳（）

A.肝脏

B.脾脏

C.胰腺

D.对侧肾皮质

E.肾周脂肪