NO.PZ2018062006000038
问题如下：
In secondary bond markets,
选项：
A.
bonds are sold with the help of an investment bank.
B.
previously issued bonds are traded among investors.
C.
individual investors are the major participants.
解释：
B is correct.
In private markets, newly issued bonds are typically traded with the help of an investment bank. Large institution investors and central banks are the major participants in the secondary market.
考点：一级 & 二级市场
解析：二级市场是投资者交易的市场，故选项B正确。债券二级市场主要参与人是机构投资者和央行，故选项C不正确。
b选项previous issued不是指一级市场发行？
