看图选择正确答案。

小题1:Bill's family name is .

A．Brown

B．Green

C．White

D．Jones小题2:Bill's aunt is

A．Kate

B．Linda

C．Lisa

D．Lily小题3:Peter has         sons.

A．one

B．two

C．three

D．four小题4:Lisa and Lily are Helen's

A．aunts

B．friends

C．cousins

D．sisters小题5:Paul is Lisa's

A．grandfather

B．uncle

C．teacher

D．father

（）是透射声功率与入射声功率之比。