-How can you know so much about what’s going on in that country?

-I’ve got a friend living there who always keeps me           . [ ]

A.informing

B.to be informed

C.being informed

D.informed

蛋白质吸收紫外光能力的大小，主要取决于

A．含硫氨基酸的含量
B．肽链中的肽键
C．酸性氨基酸的含量
D．芳香族氨基酸的含量