Herzog admits that he himself is a pet owner and pet lover. “I’m not trying to denigrate (贬低)the role of animals in human life. I’m trying to do just the opposite,” he says. “It’s entirely reasonable that our pets really do provide medical and psychological benefits, but we just don’t know how strong that effect is and what types of people it works for”. Herzog notes that Americans with Disabilities Act had to be changed in order to clarify the fact that only trained dogs and small horses that perform a specific service function could legally qualify as service animals.

　　Herzog points our that the scientific community is starting to take these issues seriously,. In2008, the National Institutes of Health began a program to fund studies that examine the medical and psychological benefits of pets on children Herzog is encouraged that psychological scientists are really becoming involved in this research: “I think in five years we’re going to have some answers to our questions”.

　　12．Why does the author mention the question in paragraph I?

　　A．To express the author’s doubts.

　　B．To compare different ideas.

　　C．To describe people’s opinions of pets

　　D．To introduce the topic for discussion.

　　13．What does the underlined word “these” in Paragraph 2 probably refer to?

　　A．Conflicting results

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