题干

下列实例中,不能利用气体或液体的“压强与流速的关系”解释的是(  )

A:行驶的轿车里,坐在靠车窗一侧的女生的长发向窗外飘扬

B:汽车在马路上快速驶过以后,马路两边的树叶会随风飘动

C:在火车进、出站时,站台上的乘客必须站在安全线以外

D:梳头的时候,干燥的头发随着梳子飘扬起来

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D

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    Six years ago, I walked into a local animal shelter on a cold, rainy day.1my house was already full of cats and dogs, I still couldn't 2an occasional visit to the shelter. This time as I was walking down the row of pens(畜栏) full of barking dogs, I3a small boy looking into one of them.

    He had a malnourished(营养不良的)looking body and a4face with a big nose5out of the middle of it. He was looking at a small golden dog. Its ribs(肋骨)were showing and its thin tail was folded between its legs. It wasn't begging for6like the other puppies7was hiding in the corner instead. The boy looked up at me with8eyes and asked what was wrong with it. “It was probably abused and9 ” I said. “That is why it is so 10 ”

    The boy 11turned to an old lady and said, “ Grandma, I want this one.” The old woman smiled and walked to the front desk to fill out the 12forms. I followed her and asked 13the boy. She told me that he'd had a 14start in life, too. She had just gotten custody(监护权) of him15the state had taken him from his parents. She hoped getting a dog would make his life 16for him. I looked back at him, holding his scared puppy, and said a prayer for them both.

    It was yesterday that I was driving down the road enjoying a gloriously sunny, spring day. Then in a green front yard I saw the boy. His 17body was tall and strong. His nose no longer 18big but fit well into his smiling face. He was throwing a ball to a healthy, happy dog shining golden hair. His little act of love and 19had indeed gone a long way. It had saved a dog's life, 20his own heart, and given this middle-aged man fresh hope for the whole world.