题目

已知某种植物籽粒的红色和白色为一对相对性状，这一对相对性状受到多对等位基因的控制。某研究小组将若干个籽粒红色与白色的纯合亲本杂交，结果如下图所示。下列相关说法不正确的是（ ） A．控制红色和白色相对性状的基因分别位于三对同源染色体上 B．第Ⅰ、Ⅱ组杂交组合产生的子一代的基因型均可能有3种 C．第Ⅲ组杂交组合中子一代的基因型只有一种 D．第Ⅰ组的子一代测交后代中红色和白色的比例为3:1What would you do if you found a snake in your house? Many people might be afraid or try to kill it. However, if you live in North Carolina in the USA,one thing you can do is to call the Snake Catchers. The Snake Catchers are four men who love snakes, even poisonous ones. Theirnewspaper advertisement says, “Snake Catchers:free snakeremoval(除去）一Please do not kill them — Call us. ” The Snake Catchers, who started their service in 1998, don’t charge anything for helping people. “We do this as a  hobby,”explained Fred Johnson, one of the Snake Catchers. Because of their love of snakes, the Snake Catchers try to keep them alive.“One man asked us to kill a python(蟒蛇), so he could make a pair of boots from the skin. We refused, because we like snakes, and we don’t want to see them killed, ” said Fred. Some of the snakes that they catch are kept as pets;some are given to the North Carolina State University. Most, including the poisonous snakes, are set free in the wild, usually in a national park. Fred suggests that people should treat snakes with care. “Actually snakes are very shy and gentle creatures. They only attack if they are frightened. However, you have to know how to treat a snake properly!” According to one happy family, the Snake Catchers are good. One day, the Greenwood family found a snake skin in the kitchen. They looked very carefully and saw a snake sleeping behind a cupboard. They thought about what to do. Then Steve Greenwood remembered the advertisement for the Snake Catchers. He called them. “The Snake Catchers arrived within an hour and they finished the job quickly too,” said Steve Greenwood. “One of them went into the kitchen, found the snake and took it out alive. The Snake Catchers did a very good job.” Last year, the Snake Catchers removed more than seventy snakes from houses in North Carolina. 1.The Snake Catchers catch snakes because          . A. they want to kill the snakes. B. they like trying to catch snakes. C. they don’t want people to hurt snakes. D. they like eating snakes. 2.When a man asked them to kill a python,the Snake Catchers          . A. agreed to do it                                            B. were very happy C. give him some old boots                  D. didn’t agree 3.The Snake Catchers set most of the snakes free          . A. in a national park                              B. in a univercity C. in a garden                                                  D.in their own houses 4.According to Fred,          . A. snakes are very dangerous B. people should attack snakes C. snakes are not usually dangerous D. people should run away if they see a snake