疡的预后关系来判断：气虚者难于（）；血少者难于（）
参考答案：起发破溃；生肌收口
He did not regret saying what he did but felt that he ______ it differently. [ ]
A. could express
B. would express
C. could have expressed
D. must have expressed
人眼看一个目标要得到视觉印象，最短的注视时间为（）S。
A.0.07～0.3
B.0.12～0.35
C.0.17～0.4
D.0.22—0.45
