随着改革的深入，我国的社会保障体系也逐步建立和完善起来，具体表现为 (    )

①国有企业下岗职工的基本生活保障得到加强②再就业工作普遍得到加强  ③城镇居民最低生活保障制度进一步健全④医疗保险制度改革也迈出了步伐

下列句子中的标点符号使用都正确的一项是

恩吉尔曼证实光合作用场所的实验所选用的材料是水绵，其细胞内的叶绿体呈（    ）．

下图中的历史人物给后人留下了许多争议和思考。下列有关她的说法中有失偏颇的是（    ）

     Tom and Mike are good friends. They are good with children. They want to find jobs in summer vacation. This Friday Tom tells Mike that Sunson School Trip needs teachers to help with sports, music and computer. Mike is glad to know that.
    Tom can play basketball, volleyball, and he can swim. Mike can play the violin, the trumpet, the drums and the guitar, and he can swim,too. Tom and Mike like computers very much. Can they join Sunson School Trip?