Science can't explain the power of pets, but many studies have shown that the company of p

Science can't explain the power of pets, but many studies have shown that the company of pets can help lower blood pressure (血压) and raise chances of recovering from a heart attack, reduce loneliness and spread all-round good cheer.
Any owner will tell you how much joy a pet brings. For some, an animal provides more comfort than a husband/wife. A 2002 study by Karen Allen of the State University of New York measured stress (紧张) levels and blood pressure in people— half of them pet owners —while they performed 5 minutes of mental arithmetic (算术) or held a hand in ice water. Subjects completed the tasks alone, with a husband/wife, a close friend or with a pet. People with pets did 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 relaxed (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 Northwestern Memorial Hospital spent a year studying 36 fat people and their equally fat dogs on diet-and-exercise programs; a separate group of 56 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 than 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.
【小题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.【小题2】We learn from the text that a person with heart disease has a better chance of getting well if .A．he has a pet companionB．he has less stress of workC．he often does mental arithmeticD．he is taken care of by his family【小题3】According to Allen, why did the people do better with pets around when facing stressful tasks?A．They have lower blood pressure.B．They become more patient.C．They are less nervous.D．They are in higher spirits.【小题4】The research mentioned in the last paragraph reports that .A．people with dogs did more exerciseB．dogs lost the same weight as people didC．dogs liked exercise much more than people didD．people without dogs found the program unhelpfulA

(答案→)A 解析：【小题1】A 主旨大意题。文章主要讨论了宠物狗对主人的影响，让他们身体更健康，精神状态更好。故文章讨论的是宠物给主人带来的积极的影响，故A正确。【小题2】A 细节题。根据第一段the company of pets can help lower blood pressure (血压) and raise chances of recovering from a heart attack, reduce loneliness and spread all-round good cheer.说明A正确。【小题3】C 推理题。根据文章第二段最后两行It seems people feel more relaxed (放松)around pets, says Allen, who thinks it may be because pets don't judge.说明有了宠物的陪伴，他们更为放松，故有更好的表现。故C正确。【小题4】A 段落大意题。根据文章最后一段最后三行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.说明有了宠物主人的锻炼更多了，故A正确。

我明天再问问老师，叫他解释下这个问题