日本多火山地震，是因为日本处于_____板块和_____板块的交界地带．（  ）

    Hello, everyone! I am your1 today. First, I'd like to 2 you something about London before we3London is a very big city of England. The people here are friendly. They are always 4 to tell visitors something about the city.

    London is a busy place. People_5hard. They are very 6 all the time (一直). London is also a very beautiful city. It has a lot of parks and gardens (花园). When you are in London, you can7the British Museum. It can tell you a lot of 8stories. You may also visit9 place. It is the River Thames. It's long and wide. There are many boats on the river.

    May you have a good10！We will get to London in two hours. Now let's have a guessing game.

已知函数f（x）=lg（x²﹣5x+6）和$g\left(x\right)=\sqrt{\frac{4}{x}-1}$的定义域分别是集合A、B，

（1）求集合A，B；

（2）求集合A∪B，A∩B．

下列计算：①0﹣（﹣5）=0+（﹣5）=﹣5；②5﹣3×4=5﹣12=﹣7；③4÷3×（﹣$\frac{1}{3}$）=4÷（﹣1）=﹣4；④﹣1²﹣2×（﹣1）²=1+2=3．其中错误的有（　　）

请结合下图回答实验室制备气体的问题：

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