Our headmaster spoke at the parents meeting for one hour without his notes.A. looking upB

问题补充：

Our headmaster spoke at the parents meeting for one hour without his notes.

A. looking up

B. bringing out

C. referring to

D. learning about

答案：

A. looking up

B. bringing out

(答案→)C. referring to

D. learning about

解析：短语辨析。A查找；B取出，拿出；C参考，查阅，提及；C了解；句意：我们的校长不看笔记本在家长会上讲了一个小时。根据句意说明C正确。