按照美国的做法，垃圾债券一般是指信用评级在BBB(Baa)以下的债券，又称为( )。

A．无风险债券

B．无收益债券

C．高风险债券

D．投资级债券

The jurors came to a deadlock in the defendant’s trial for murder.

A. a decision of guilty
B. a decision to punish by electrocution
C. an impasse
D. an unusual verdict