—Why does Bill wear glasses?

—Because ________. [ ]

A. he is good at eyesight

B. he is bad for eyesight

C. he is poor at eyesight

D. his eyesight is bad

“羊皮鼓舞”是（）民族的传统民间舞蹈？

A.傣族

B.维吾尔族

C.羌族

D.藏族