It best .Those tested with their animal friends had smaller change in blood pressure and returned

　　Most quickly to baseline heart rates .With pets in the room ,people also made fewer math mistakes

　　Than when doing in front of other companions. It seems people feel more released (放松)around

　　Pets, says Allen, who thinks it may be because pets don’t judge.

　　A study reported last fall suggests that having a pet dog not only raises your spirits but may also have an effect on your eating habits. Researchers at Northwesterm Memorial Hospital spent a

　　Year studying 36 fat people and were put on a diet-and-exercise programs; a separate group of

　　56 fat people without pets were put on a diet program. On average，people lost about 11 pounds，

　　Or 5% of their body weight .Their dogs did even better，losing an average of 12 pounds，more then

　　15%of their body weight .Dog owners didn’t lose any more weight than those without dogs but ,say

　　Researchers，got more exercise overall –mostly with their dogs –and found it worth doing.

　　(

　　) 1. What does the text mainly discuss?

　　A．What pets bring to their owners

　　B．How pets help people calm down

　　C．people’s opinions of keeping pets

　　D．Pet’s value in medical research

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