题目

Though the blacks in the United states have been fighting for equal rights ________ the whites for many years, they _________ won the battle. A . to; still haven't B . to; haven't still C . with; still haven't D . with; haven't still 答案：C下列有关实验现象描述正确的是（ ）A．硫在空气中燃烧产生蓝紫色火焰B．一氧化碳还原氧化铁，固体由黑色变成红色C．镁和盐酸反应，放出热量D．铁和稀硫酸反应，溶液由无色变为黄色