参与人民币利率互换业务的机构主要有（）。
A.商业银行
B.期货公司
C.中央银行
D.证券公司
参考答案：A, D
. Look! There is a whole crowd of people over there. Go and see what_____ and if it is a bargain, buy it.
A is selling B is being sold C has been selling D has been sold
室间隔缺损患者有时出现声音嘶哑，其原因最可能是（）
A.扩张的右心房压迫喉返神经
B.扩张的左心房压迫喉返神经
C.扩张的主动脉压迫喉返神经
D.扩张的肺动脉压迫喉返神经
E.扩张的左、右心房压迫喉返神经
