给下列数字填上恰当的单位：

（1）课桌的高度大约是80 ____　．   

（2）一张纸的厚度约为70　 ____　．

（3）万里长城全长6.7×10^6 ____．

（4）人正常步行的速度约为5 ____．

下列句中没有语病的一项是(      )

    I was sitting at the kitchen table finishing my morning meal. A little taste of autumn1had risen in my soul. The2 air and falling leaves all 3 the coming of the winter. I took my last drink of meal and carried my4 bowl over to the sink to clean it. My two cats sat on top of the kitchen counter,5 above them. I saw that they were both eyeing a tiny spider on a single web from the light above. Just as the spider came near,6cats were well prepared to catch and eat him. I quickly took a paper towel and 7 the little guy before he became a kitty 8I walked out of the back door to let him 9. As soon as I set him down he quickly crawled to 10on the wall. As I shut the door, I noticed something too. I was 11and my sadness was gone.

    Now I know a lot of people would be 12 about how saving the eight-legged animal could have 13my spirits, so quickly. After all, it was just a spider. As I thought about it, two sentences I had recently read 14me. The first was: “The only true thing is 15” The second was: “ Do everything out of love.” I realized then that no act of love is 16 I had only spared a spider to live another day, but it had 17my heart and improved my spirit.

    Make your life full of love. When you do so, you will18not only yourself, but others and this world. Your soul will 19 the cheers of other people.20 people's eyes every smile you share is a treasure, and every kind act you do is a triumph(胜利).

小刚吃冰糕时，把冰糕放在碗里，发现碗中的水越来越多，在这个过程中冰糕发生的物态变化是 ____；他用手一摸碗壁，发现碗“漏水”了，这是空气中的水蒸气遇冷在碗壁上发生的 ____（填一种物态变化）现象．