（）是指在浮选过程中用以控制气泡大小、维持气泡稳定性的浮选剂。
A、捕收剂
B、起泡剂
C、调整剂
参考答案：B
The performance of the host, _______ to please the audience and draw their attention, was greeted with a cold silence, however.[ ]
A. had intended
B. intended
C. intending
D. to intend
《阅微草堂笔记》的作者是（）。
