在城市，排在第一位的癌症是____；在农村，排在第一位的癌症是____；在青少年和儿童中，排在第一位的恶性肿瘤是____。

每个时代都有每个时代的精神，每个时代都有每个时代的价值观念。这表明（  ）

①社会存在决定社会意识

②社会意识具有相对独立性

③社会存在的变化决定社会意识的变化

④社会意识的变化独立于社会存在的变化

    Hello! Nice to meet you. Now let me introduce myself (自我介绍) to you. My name is Mary. I'm 12 years old. I'm from Canada and I speak English. I'm a tall girl. I have long brown hair and big blue eyes. I like music a lot. I often sing songs with my friends in my free time. I have a happy family. There are four people in my family. They are my mom, my dad, my sister and me. I like China very much and I want to visit Beijing, but I can't speak Chinese at all.

    I hope (希望) to be your friend, then we can help each other with English and Chinese.

根据材料内容，选择最佳答案。