500×45×98=450（元），
答：四年级同学捐款450元．
Audiences and critics were _____ by its originality, vitality, and excitement of the Beijing Olympic opening ceremony. [ ]
A. happened
B. reflected
C. occurred
D. struck
北京化工大学研究生奖学金评选对象为（）。
A.委培生
B.非定向生
C.全日制在校研究生
D.定向生
