第一节 单项填空 （共15小题； 每小题1分，满分15分）
21. As we know , awful railway traffic accident which happened on April 28 caused ____ population of more than 70 to death.
A. a; the B. an ; a C. the ; the D. the ; a
22.------What do you think of the talk given by Professor Smith last night?
------I think you’d call it a lecture _________ a talk.
A. other than B. rather than C .regardless of D. as well as
