I think of the materials I listen to at the beginning of the exam easy.
A. two thirds, is
B. second three, are
C. two thirds, are
D. two third, are
网友回答
A. two thirds, is
B. second three, are
(答案→)C. two thirds, are
D. two third, are
解析：基数词十序数词的适当形式.作主语时，根据后接的名词的单复数，本题后接的可数名词复数形式，故选C