阅读理解。 Cats and dogs are both popular pets. Cat owners think that cats are nicer pets in some ways. Cats are cleaner, first of all. They keep themselves clean, and they do not make the house dirty. Cats are also quieter than dogs. They usually do not make a lot of noise. Cats are safer, too. Dogs sometimes bite people, but cats almost never do. Finally, cats are easier to take care of. You do not have to spend much time with a cat. In fact, many cats prefer to be alone. Many children want to have a pet. Some parents may not like the idea of a dog or a cat in the house, but pets can be good for children. A pet is fun for a child to play with. This can be especially important if there is only one child. Also, children can leam a lot from a pet. They can learn about animals and the natural world. Children also leam about taking care of something. They cannot forget about their pets. This is an important lesson for all children. Most Americans think of cats as pets, but not all cats are pets. Some cats can help people, but others can be problems. For example, on farms and in old houses, they kill small animals such as rats or mice. However, some people do not want cats around. They like to watch birds in their yards. Cats may kill the birds or scare them away. Cats can also be a problem in cities. In Rome, for example, thousands of cats live in the streets and old buildings. They make a lot of noise, and they are dirty and dangerous. 1. The owners of cats think that cats are _____ than dogs. A. safer but dirtier B. cleaner but noisier C. more interesting and safer D. cleaner and quieter 2. Pets are good for children because _____. A. pets are very popular B. pets help children leam a lot C. pets are easy to take care of D. pets help children forget everything 3. We can learn from the last paragraph that _____. A. cats can help on farms B. cats and birds are friends C. cats prefer living in cities D. cats are thought as pets by all