计算$\frac{x-y}{\sqrt{x}-\sqrt{y}}$=____ ，$\sqrt{{\left(\sqrt{3}-2\right)}^2}$=____ 

我们逐渐长大，或多或少会同父母产生“爱的冲突”，这是正常现象，应该任其发展。

下列依次填入横线处的词语，恰当的一组是（     ）

①由文化局、教育局联合举办的艺术展极大地活跃了当地的文化生活，　　　，有数十万当地人参加了相关活动。

②由节气演变为风俗、演变为节日的，在二十四节气中也只有清明了，从某种程度上说，清明节也是人性美好的体现，它不是给自己过节，而是　　　对先人的怀念。

③20世纪70年代以来，人们关于全球变暖的诸多　　　，在21世纪都将会进一步显露出来，成为现实。

④北京师范大学于丹教授认为，与其怨天尤人，不如躬身自省，如果我们真的能够做到把握分寸，谨言慎行，礼行天下，修身养性，我们会少很多烦恼，自然就会懂得为人　　　之道。

       There is no doubt that mothers play an important leading role in the lives of their children. But what about a father's role? I believe that fathers play just as important a role as mothers.
       Fathers give us support. They are the shore（岸）we swim to when our arms and legs feel increasingly tired. They are the strength we rely on （依靠）as we take our first steps into the world. Fathers can be gentle and powerful, but they probably have the simplest love we ever know.
_______, the father is their first hero and possibly the only man they will ever feel comfortable loving.
For daughters, the father is the first man they admire and the first man whose eyes shine with happiness when they look at them. He is the first man to fall in love with them.
        For mothers, the father of our children is the person we can believe in to watch over the babies as closely as we would. We are protectedin the knowledge of their love. A father is the person on the planet with whom we can do whatever we want ... one who will be just as interested and never feel bored in the face of our devotion.
        Without fathers, we wouldn't be mums. I would like to thank them from all our hearts for this honor and for being our partners in the business of raising children.