贴现实际上是一种信用业务。 ( )
参考答案：对
Recently I realized the fact that I can now organize my own time, which ______.
A．makes a good sense
B．makes a great contribution
C．makes a deep impression
D．makes a big difference
干扰素的种类有（）
A.α干扰素
B.β干扰素
C.γ干扰素
D.δ干扰素
E.ε干扰素
