维修技工甲说：导线的直径越小，其电阻值越大。维修技工乙说：导线的美国线规标号越小， 其电阻值越小。他们哪位是正确的？

[单选题]     When I was young, I spent my summer vacations on my grandparents' farm. The summer that I graduated from college, I  56   my grandparents once again. When I arrived,I discovered that there was a family  57  in progress.     Grandpa's dog and hunting partner, Rusty, had taken on a very bad   58  in his old age. He had begun  59   into the chicken coop (鸡笼) and eating eggs. In the eyes of the local farmers,  60 dogs started stealing eggs, there was no  61  to cure them. They knew there was only one thing to be done  62   such a dog-you had to shoot it and the sooner the  63  .     Rusty and Grandpa were old friends. Grandpa certainly didn't  64   to shoot Rusty,but he knew it needed to be done. The 66egg money" was Grandma's private income, so you can imagine  65  she felt about the problem. 66  the inexperienced confidence of youth, I told Grandpa that I thought I could"cure"the egg-stealing dog. I wanted to at least have a  67  to save Rusty's life, and save Grandpa from the sadness of  68  Rusty.      The next morning, I broke open six fiesh eggs and put them in Rusty's bowl   69 at the door to the chicken coop. Rusty came 70  and noticed the eggs. He quickly  71   the eggs and happily walked off for his nap (打盹). The following morning I did the  72  thing.I put the eggs a few feet away from the chicken coop, toward the back door of the farmhouse  73   Grandma usually fed Rusty. The next day I again moved the bowl closer to the house, and added some dog food to the eggs. Every day I moved the bowl closer to the back door, mixing more dog food and   74   eggs. By the time the bowl reached the door, it was all dog food and no eggs. Rusty had again become   75 to looking for his food at the back door of the house, and never again went into the chicken coop.56.A.watched     B.noticed    C.invited    D.visited

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