从童年到成年的过渡阶段，生殖器官开始发育到成熟的时期是 （  ）

We like playing table tennis          school.

探究“锡纸”中金属的成分：“锡纸”中的金属是锡吗？

【查阅资料】

①“锡纸”是锡箔或铝箔和纸黏合而成；

②锌粉是一种深灰色固体；

③锡(Sn)与酸或金属化合物溶液反应生成＋2价的锡的化合物。

【提出猜想】

猜想Ⅰ：“锡纸”中的金属是锡；

猜想Ⅱ：“锡纸”中的金属是铝。

根据内容完成Sally's family tree.

    I'm Sally, I'm a student in No.14 Middle School. This is my family tree. You can see it is a big family. My father is Jonathan, my mother is Claire. They have three children. My brother's name is William and my sister's name is Olivia. My grandparents Jerry and Elizabeth have two sons. My uncle Mike and my aunt Sarah have a son, his name is Joseph. He is my cousin. He is four years old. We all love him very much.

①____ ②____ ③____ ④____ ⑤____