问题补充：
President Obama made a speech for half an hour withouthis notes.
A. bringing back
B. looking up
C. trying on
D. referring to
答案：
A. bringing back
B. looking up
C. trying on
D. referring to
解析：短语辨析。A回忆，带回；B查找；C试穿；D提及，参考；句意：奥巴马总统发表了半个小时的演讲都没有看笔记本。根据句意说明D正确。
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