FDA为宠物食物生产厂商提供了指导原则，故C项正确。

　　【答案】　C

　　3．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

　　【解析】　细节理解题。根据第三段的第二句"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"可知，正如准备人类食物一样，为宠物准备生食时要用热水和肥皂洗手、清洗容器和与食物有接触的表面，故A项正确。

　　【答案】　A

　　4．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.

　　【解析】　细节理解题。根据最后一段中的"If pet owners choose to feed bones to their pets，they should watch their pets carefully when they are eating bones"可知，该段建议人们，当宠物吃骨头时，主人应当仔细观察，以防宠物被骨头卡住，故D项正确。

　　【答案】　D

　　B

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