Helen often ______ a lot of time listening to music.

A．costs

B．pays

C．takes

D．spends

牛黄的鉴别特征为( )。

A．“珍珠虹光环”
B．“吻鳞不切鼻孔”
C．“方胜纹”
D．“挂甲”
E．“冒槽”