请结合图示回答下列实验室制取气体的有关问题．

大千世界，无奇不有。2015年3月1日下午，英国的业余摄影师Le-May用相机记录下了一只黄鼠狼骑在一只啄木鸟背上飞行的场景，如图。这张照片在网络上迅速走红并被不断的PS。关于图片中涉及到的物理知识描述错误的是：（   ）

已知点P₁（x₁，y₁），点P₂（x₂，y₂）是同一个反比例函数图象上的两点，若x₂=x₁+4且 $\frac{1}{y_2}$ = $\frac{1}{y_1}$ ﹣3，则这个反比例函数的表达式为____．

我国汉族最为集中的地区是（    ）

    Today is Friday. Peter has six classes today. He goes to school at 7:30 a.m. At 8:00 a.m., he begins his first class. The first class is English. At 9:00 a.m., he has math. Peter likes math because it’s interesting. At 10:00 a.m. she has a biology class. Peter thinks it's very boring. Then at 11:00 a.m., he has a history class. That's his favorite subject. He can learn a lot about the past from history.
    Peter has lunch at school at about 12:00. Then he has a short break. At 1:30 p.m., he has a music class. At 2:30 p.m., he has a P.E. class. Peter likes this afternoon, because music and P.E. are easy and interesting. School is over at 4:00 p.m. Peter is happy because he can go home and have a good time on Saturday and Sunday.
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