A：健全社会保障制度是维护劳动者合法权益的根本措施
B：社会保障体系的完善需要经济发展为其奠定物质基础
C：就业是民生之本，我们要实施积极的就业政策
D：坚持权利与义务相统一是每个劳动者的正确选择
宋朝李纲曾高度评价隋文帝“混南北为二区”的历史功绩。认为隋文帝“雄才大略，过人之聪明。其所建立，又有卓然出于后世者”。李纲的评价反映了隋文帝一生的最大作为是（ ）
鱼儿不停地用口吞水，再从鳃孔把水排出，其意义是（ ）
Mr Green is an Englishman. He teaches English well His English classes are very interesting. He likes us and we like him, too. Mr Green has two children----Mike and Nancy. Mike is eight and his sister Nancy is five. Mike goes to school but Nancy doesn’t. Mr Green likes to wear a T-shirt and a pair of jeans. Football is his favorite sport. After school we often have a basketball match. Sometimes Mr Green watches and joins us. He plays basketball just for us.
一份溶质质量分数为8%的氯化钠溶液蒸发掉100g水后，其溶质质量分数变为24%，则原溶液中溶质的质量为（ ）
