James McDonald and Veasna Lu were discussing different ways of valuing a Treasury security. During their discussion Lu made the following statements: Statement 1: It is inappropriate to discount the cash flows of a Treasury security by a single discount rate because that is implicitly assuming that the yield curve is flat. Therefore, each individual cash flow should be discounted by its corresponding spot rate. Statement 2: The spot rates used for different time periods that produce a value equal to the market price of a Treasury bond are called forward rates or future expected spot rates. Are the statements made by Lu regarding bond spot rates correct Statement 1 Statement 2 （）①A. Correct Correct②B. Incorrect Incorrect③C. Correct Incorrect

A. ①

B. ②

C. ③

关于房水的描述，不正确的是（）

A.房水主要通过睫状突无色素上皮细胞主动分泌产生

B.房水中钙的浓度只有血浆中的一半

C.乳酸盐离子是房水中最丰富的有机阴离子

D.房水中的蛋白远高于血浆，最多的为转铁蛋白和白蛋白

E.房水中维生素C的浓度远高于血浆浓度