下列基因组成中，一般属于生殖细胞的是（）

若直角三角形的两条直角边长分别为3cm、4cm，则斜边上的高为(     )     

⑴抛出一个图钉，图钉着地后，钉尖朝上甲胜，钉尖朝下乙胜．

⑵六个小朋友，依次编号是1，2，3，4，5，6，他们想用掷骰子的方法选其中一个当队长．骰子着地时，朝上的点数是几，就几号当队长．

⑶小欣和小卫在如图形状的口袋里摸球，每次任意换一个球，然后放回，每人摸13次．摸到白球小欣得1分，摸到黄球小卫得1分，摸到其他颜色的球两人都不得分．

    I'm Peter. There are four people in my family. They are my father, my mother, my grandfather and me. I'm twelve. My birthday is on 15th March. My parents are both doctors. They help people. Their birthdays are both in May. My grandfather is old. He is sixty-five. His birthday is on 9th June. He likes reading. I like reading too. I want to be a teacher in the future. I want to teach Chinese in a school.