问题补充：
The Qingming Festival which is also calledPure Brightness Festival, falls on April 5 every year, it istime-honored tradition(悠久的传统) for the Chinese to honor their ancestors.
A. The; a
B. /; the
C. The; the
D. /; a
答案：
(答案→)A. The; a
B. /; the
C. The; the
D. /; a
解析：句意:也被叫做清明节的清明节,在每年的四月五日,对于中国人来说是纪念他们的祖先的一个悠久的传统.结合语境可知前一空特指某个节日,故用定冠词.后一空泛指任何一个悠久的传统,故选A.
