在道德规范体系中,居于主导地位并成为区别不同道德类型显著标志的最根本的行为准则的是()。
参考答案:道德原则
So far, all of the infected people are thought _______ the flu after direct contact with sick birds.
A.to have caught
B.having caught
C.to catch
D.being caught
新生儿生理性体重下降多久恢复到出生时体重()。
A.1天~2天
B.2天~3天
C.3天~7天
D.7天~10天
E.10天~14天