carefully to protect themselves against possible dangers, says Burk. Just as when you are preparing foods for human beings, use hot water and soap to wash your hands, containers, and surfaces that come into contact with the food. Don't put your hands near your mouth until you have washed them, and don't allow your pet to touch your face right after it has eaten raw meat.

"If pet owners choose to feed bones to their pets, they should watch their pets carefully when they are eating bones," Burk says, "If a pet eats a big piece of bone that won't pass through its digestive system(消化系统), it is likely to kill the pet."

28. What does William Burk think of feeding pets on raw meat?

　　A. It'll make the pet owners sick.

　　B. It'll keep the pets' wild nature.

　　C. It's against the policy of the FDA.

　　D. It's dangerous and lack of nutrition.

29. The FDA has provided guidelines for producers of pet foods with raw meat because ________.

　　A. pet safety is a serious problem

　　B. most pets lack nutrition

　　C. feeding pets on raw foods is popular

　　D. the quality of pet foods is dropping

30. Those who feed pets on raw foods should do some necessary cleaning when ________.

　　A. preparing raw meat for pets

　　B. touching the food containers

　　C. taking their pets out for a walk

　　D. preparing foods for human beings

31. What suggestion is given to pet owners in the last paragraph?

　　A. Pets should be forbidden to eat raw bones.

　　B. Pets should be kept away from the raw meat.

　　C. Pets should be checked on their digestive system.

D. Pets should be watched carefully while eating bones.

D

　　Why is pink or purple a color for girls and blue or brown for boys?

　　The answer depends largely on cultural values as well as personal experiences. To the Egyptians, green was a color that represented the hope and joy of spring, while for Muslims, it means heaven. Red is a symbol of good luck in many cultures. In China, children are given money in a red envelope to bring good fortune in the New Year. For many nations, blue is a symbol of protection and religious beliefs. Greek people often wear a blue necklace hoping to protect themselves against evils(灾祸).

People's choice of colors is also influenced by their bodies' reactions toward them. Green is said to be the most restful color. It has the ability to reduce pain and relax people both mentally and