单项选择题
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
A．has more influence on rock music B．has sold fewer records of his songs C．is more important in the record industry D．is less important in American rock