阅读下面短文，从A、B、C、D四个选项中选出最佳选项。

Where does the wind come from? What makes the wind move(移动) all the time? Scientists tell us that it is the sun. That makes air move, and makes it blow(吹). When the sun shines on the earth, it makes the earth hot. Then the earth makes the air hot. When the air becomes hotter, it also becomes lighter(更轻). The light air goes up. Cool air comes into take the place of（代替） the hot air. The hot light air goes up higher and higher until it becomes cool. Then it comes down again, and then the earth makes it hot again, and it has to go up. When the air move, it has wind.

①M，N用导线相连后，同时插入稀H₂SO₄中，M极为负极

②P，Q用导线相连后，同时浸入稀H₂SO₄中，电子由P→导线→Q

③M，P相连后，同时浸入稀H₂SO₄，P极产生大量气泡

④N，Q相连后，同时浸入稀H₂SO₄中，Q极发生氧化反应，

则四种金属的活动性顺序为（   ）

世界上没有两片完全相同的树叶，也找不出没有任何差异的两个人，这句话表明（　　）