1. ______ don’t sleep.
A. Ants B. Elephants C. Monkeys
2. Snails(蝸牛) can sleep for ______ .
A. Ten days B. two months C. three years
3. Giraffes sleep for about ______ hours a day.
A. 2 B. 5 C. 8
4. ______ sleep with eyes open.
A. Horses B. Fish C. Dolphins
People do not smell when they sleep.