A.I am very pleased to have this opportunity to....
B.First let me express my gratitude 
C.Now after a short introduction I would like to read to the main part of my paper...
D.The last part of my report will be devoted to....

A.對論文的各個環(huán)節(jié)如標題、論點、論據(jù)、論證過程、結論等逐一進行檢驗
B.對論文的表述形式進行檢驗
C.對論文的語言、符號進行檢驗
D.對論文的文字、標點進行檢驗