题干

下列叙述正确的是(   )

A:pH=3和pH=4的盐酸各10mL混合,所得溶液的pH=3.5

B:溶液中c(H+)越大,pH值也越大,溶液的酸性就越强

C:液氯虽然不导电,但溶于水后导电情况良好,因此,液氯也是强电解质

D:当温度不变时,在纯水中加入强碱溶液不会影响水的离子积常数

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D

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    A long time ago there was a boy. He was smart, talented and handsome.  1, he was very selfish and his temper was so 2 that nobody wanted to be friends with him. Often he got angry and said various 3things to people around him.

    The boy's parents were very 4 about his bad temper. They considered what they could do and one day the father had an idea. He called his son and gave him a hammer and a bag of5.The father said: “Every time you get angry, take a nail and 6 it into that old fence as hard as you can.”

    The fence was very7and the hammer was heavy, nevertheless the boy was so angry that during the very first day he drove 37 nails.

    Day after day, week after week, the number of nails was gradually8. After some time, the boy started to understand that 9 his temper is easier than driving nails into the fence.

    One day the boy didn't 10 hammer and nails any more as he learned to hold his temper perfectly. So he came to his father and told about his11. “Now every time, when you hold your temper all day long,12 one nail”.

    Much time has passed. At last the boy could be13 of himself as all the nails were gone. When he came to his father and told about this, he14to come and take a careful look at the fence. “You did a good job, my son,15 pay your attention to the 16 that were left from the nails. The fence will 17 be the same. The same happens when you say hurtful things to people, as your words leave18 in their hearts like those holes in the fence. Remember, we need to 19 everyone with love and respect. It doesn't 20 that you say you are sorry, because the scars will not disappear.