社会主义五百年的历史告诉我们，巩固和发展社会主义制度，还需要几代人、十几代人甚至几十代人的努力。
参考答案：对
下列物质中，灼烧时会产生烧焦羽毛臭味的是 [ ]
A.棉花
B.羊毛
C.晴纶
D.尼龙
CAN YOU BEACH means（）.
A.can you go to the beach
B.can you run the vessel upon a beach to prevent its sinking in deep water
C.can you handle the vessel along the beach
D.can berth along the beach
