眼球壁分几层()
A.分内外两层
B.分内、中、外3层
C.分角膜、巩膜、脉络膜、视网膜4层
D.分角膜、巩膜、色素膜、脉络膜、视网膜5层
E.以上均不是
参考答案:B
—Can you go to the mall with me this Sunday?
—________, because I have to babysit my sister.
A.Sure
B.No
C.Yes
D.Sorry
债券的期限越长,流动性溢价越小,体现了期限长的债券拥有较低的价格风险。( )