题目

Cats are animals of habit. They like to go to sleepy about same time every day and for a certain length of time. They seem to have natural clock inside them that tells them when sleeping. Besides their regular sleep, cats take naps(打盹). Some scientists think that people should also take cat nap. The habit would do good for people's health. Cat naps helped build up energy in the body. Since cats have moods(情绪) like these of people, scientists believe that people can improve their moods with cat-napping. People might become more happier and more active. 估算的值 [　　] A．在1到2之间 B．在2到3之间 C．在3到4之间 D．在4到5之间