（）能产生不可控制目标点的自由方向的灯光。
A.目标点光灯
B.自由点光灯
C.目标线形灯
D.自由线形灯
参考答案：B
Lisa, could you tell me ________ yesterday?
A．what did the teacher say
B．what the teacher said
C．what will the teacher say
D．what the teacher will say
黄柏的主要成分是（）
A.挥发油
B.皂苷
C.生物碱
D.黄酮
E.香豆精
