施用农药DDT的地区，虽然占陆地面积的一部分，可是在远离施药地区的南极，动物体内也发现了DDT。这种现象说明了（　　）

两年多的时间，脑瘫女孩黄杨用鼻子和下巴触摸手机屏幕，完成了60多万字的创作。她在自己的第一条微博中写道：“失败是成功的影子，如果你勇敢地选择面对，从镜子中看到的，将会是最出色的自己。”这启示我们（    ） 

     Cats' sense of smell is very important to their health. Many cat owners have seen a cat smell the food and refuses it. Careful sniffing tells the cat if something is safe to eat.
     Cats have a pair of vomeronasal organs(犁鼻器) on the roof of the mouth. When the cat wants to sniff, she will breathe the air in through her mouth. At this moment, she will often squint(斜视) her eyes and maybe even flatten(使…平坦) her ears. This makes her look like she is making faces. The vomeronasal organs will then analyze the smell---almost as if the cat is tasting the smell.
      When you come home from outside the house, your cat can smell what you had for lunch and for a mid-afternoon snack. She can smell the people you shook hands with and your neighbour you stopped to talk to and hug. She can smell the grass brought under your shoes as you took a shortcut across the lawn. Your cat's sense of smell is so good that she can smell difference between a gallon of water with a teaspoon of salt in it and plain water. In comparison, we think of salt as completely tasteless.
      Cats have scent glands(臭腺) on each side of the forehead, on the chin, the lips and next to the tail. When your cat rubs up against your hand, your leg, the sofa, and your bed, she is leaving her scent in those things. She will then use her sense of smell to recognize “her” things, people and even other pets in the home.
       If you want to have fun with your cat’s sense of smell, take some small bits of different things, such as a bit of chicken, some flowers and some fish. Place each different scent under a piece of paper towel(so your cat cannot see any of them) and encourage your cat to investigate and find what kind of food she likes to eat best.

阅读短文, 从每题所给选项中选出可以填入空白处的最佳选项。

    Once upon a time, a little fish lived in a pond. But she wanted to go to the forest. The pond was deep, and high banks keep it from the view of the forest. Wanting to see the forest, the fish would jump out of water now and then, reaching 1 over the pond with the strength of her tail. It seemed to her that, with a little more effort, she could fly, but unfortunately each time she would fall right back into the 2.

    The fish's mother—a big fish with kind eyes would 3, “What would you want the forest for? We fish must live in water, and that is the way it is.”

    The fish would answer, “I want to go to the forest and that is my 4. And it must come true.”

    So she went to the little fairy(仙子) who had been friends with her for her whole life and pleaded(恳求), “Oh little fairy! I have been living in the water all the time. Now I am 5 my small world. I want to see those big trees covered with beautiful flowers, leaves and fruits. I want to meet 6 and animals.”

    To make her friend happy, the little fairy swung her little wand(魔杖). The rain started falling on the earth, and a few days later, the forest around the pond was covered with water,

    7 the small pond into a lake. The fish swam to the forest. How 8 it was! The fish was very excited because her dream would come true soon.

    “Hello,” the fish said to the flowers and the trees. She 9 on and saw animals sitting on fallen trees which were sticking out of the water. But as soon as she swam closer to the trees, she saw that all the animals were very sad. “We are without 10. The water has flooded the whole forest,” the animals told the fish 11. All this made the fish very unhappy.

    “I am 12 with this rain but my friends—trees and animals are quite unhappy. Oh little fairy! Please 13 the rain. I will go back to my pond. I will be more pleased when trees, animals and birds are happy,” pleaded the fish. The water began to 14 , and the animals were very glad and ran off, and the fish 15 to the pond and she was happier than ever before.

    The art of happiness is to serve all. To be really happy, we must think not only of how we can help ourselves, but how we can help others.