A keynote speech （）。

A keynote speech （）。
A.is usually given in parallel session
B.should capture the central theme of the conference
C.is usually given by well-known experts in a particular field
D.is usually one of the highlights of a conference
正确答案：should capture the central theme of the conference； is usually given by well-known experts in a particular field；is usually one of the highlights of a conference