单项选择题

单项选择题 引发事件冒泡时，要阻止事件冒泡可以使用（   ）语句 A.  preventDefault() B. stop( ) C. stopPropagation() D. return null

单项选择题 According to the author, which of the following is NOT a reason why science-fiction stories are believable? A、Many science-fiction authors are scientists. B、They are about situations that will one day be true. C、Old science-fiction stories include technology that has become a reality. D、They portray the true potential of humanity.