A public health campaign _____ the number of heart disease deaths by 80 percent over the past three decades．

A．had reduced B．had been reduced

C．has reduced D．has been reduced

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D

Science can't explain the power of pets, but many studies have shown that the company of pets can help lower blood pressure (血壓) 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 (緊張) levels and blood pressure in people - half of them pet owners –while they performed 5 minutes of mental arithmetic (算術(shù)) 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.

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1.What does the text mainly discuss?

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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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C．he often does mental arithmetic

D．he is taken care of by his family

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B．They become more patient.

C．They are less nervous.

D．They are in higher spirits.

4.The research mentioned in the last paragraph reports that

A．people with dogs did more exercise

B．dogs lost the same weight as people did

C．dogs liked exercise much more than people did

D．people without dogs found the program unhelpful

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