Hello! My name is Wendy. I live in the city. My family doesn't have a car, so I go to school on the bus. There are four people in my family. They are my parents, my brother and I. We live happily together.

    At school, I study very hard. I am very good at English. I often help my classmates with their Chinese and English. I enjoy learning.

    I am a quiet girl. I like reading and listening to light music. I have some friends. We always spend time together, they are very funny and friendly. I wish we can be friends forever.

在一种溶液中加入氯化钡溶液，产生白色沉淀，再加酸，沉淀不溶解，则这种溶液中（　　）

下列岩石中，按成因属于同一类的是（　　）

列宁说“所谓税赋，就是国家不用付任何报酬而向居民取得东西。”这主要说明税收具有（  ）

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