发绀的决定性因素是（）
A.心脏有右向左分流
B.心功能衰竭
C.红细胞数量
D.血液中还原血红蛋白的绝对量
E.血压过低
参考答案：D
52+53+54+55+56+57+58=______．
It is her rude manners that I dislike, _________ what she actually said. [ ]
A. other than
B. less than
C. no more than
D. rather than
