单项选择题
A.notice an emergency B.go through two steps before they act C.depend on each other D.feel direct responsibility
A.Because they were afraid to be killed. B.Because they were cruel in their hearts. C.Because they thought others would help. D.Because they didn't notice the emergency,
A.the more people there are together, the more people will act to help B.college students would be more likely to help than ordinary Americans C.the more people there are together, the fewer people will act to help D.none of the tested students acted to help