下列各组离子能在水溶液中大量共存的是

①表明市场竞争是不公平的

②表明它们的个别劳动时间与社会必要劳动时间的关系不同

③有利于汽车行业的技术进步和发展

④表明各个企业的劳动生产率不同

    LONDON (Reuters) — British milkman Steve Leech, who saved several shops and flats by putting out a fire with 320 pints of milk, was celebrating Thursday after winning a national bravery award.
    Leech, 35, named "Hero Milkman" by the National Dairymen's Association, said that he had noticed smoke coming out of a shop in Cornwall, southern England, while delivering (递送) milk as usual a year ago.
    “I saw the flats up above and thought I'd better do something. So I kicked the door in and started pouring milk everywhere,”Lee told Reuters Thursday.
    “When firemen arrived, the fire was almost out,”he said. Firemen said he had helped save the lives of eight people living in the flats above the shops.
  “It was hard work opening all those bottles, especially since they have tamper-proof lids. But it was even harder trying to explain to my boss where all the milk had gone.”

根据短文内容，选择正确答案。

    Peter was a small boy. He lived with his parents in a small house near some hills. The people there were all poor.

    One night it was very dry and windy. When everybody was asleep, Peter suddenly heard some noise. It came out from the kitchen. He got up and walked to the kitchen. He found that the wood beside the stove was burning. There was no water tap (水龙头) in the house, so he could not put out the fire. He shouted loudly to wake up everyone in the house. Then he ran out of his house and knocked on the doors of many houses to wake the people up. They all left their houses quickly.

    At last the firemen put out the fire. Many people lost their homes. But luckily, all of them escaped the fire with a whole skin.

对人类来说，生物学的确太重要了！