history可數(shù)嗎

　　例句：

　　I have a history class at 9 o'clock.

　　我9點鐘有歷史課。

　　It was the study of history that gave birth to the social sciences.

　　對歷史的研究孕育了社會科學(xué)。

　　I loved history when I was at school.

　　我上學(xué)時喜歡歷史。