等腰三角形底边长为5cm,一腰上的中线分其周长的两部分的差为3cm，则腰长为 （     ）

珍____、____

币____、____

财____、____

赔____、____

贫____、____

购____、____

读《黑羊》，根据课文内容填空

从前有一个国家，人人都是小偷。这个国家的人们过着____生活的。有一天，来了一个不偷东西的诚实人，生活在这个小偷王国。结果，“____”的生活秩序被打乱，平衡被破坏了，____出现了！

某生物的卵细胞中有6条染色体，其中来自这个生物父方的染色体（   ）

阅读下列短文，从每小题的三个选项中选出最佳选项。

    Hello, I'm Ann. This is my family. There are five people in my family. My grandparents are old. They are teachers. My father is tall. He has a white shirt. He is a fireman. He is not afraid of fire. He can help people. He likes his job. My mother is tall and beautiful. She has long hair. She has a yellow skirt. She is a nurse. I don't have any aunts. What about you?