根据以下材料，回答题Happy Marriage， Happy HeartHappily married people have lower blood pres

根据以下材料，回答题

Happy Marriage， Happy Heart

Happily married people have lower blood pressure 51_______ unhappily married people or

singles， a Brigham Young University study says.

On the other 52_______ ， even having a supportive social network did not translate into a blood pressure benefit for singles or unhappily married people， according to the study.

"There seem to be some unique health benefits from marriage. It"s not just being married 53_______ benefits health-what"s really the most protective of health"is having a 54_______ marriage，" study author Julianne Holt， Lunstad， a psychologist who specializes in relationships and health， said in a prepared statement.

The study included 204 married and 99 55_______ adults who wore portable blood-pressure monitors for 24 hours. The 56_______ recorded blood pressure at random intervals and provided a total of about 72 readings.

"We wanted to capture participants" blood pressure doing whatever they normally 57_______ in everyday life. Getting one or two readings in a clinic is not really 58_______ of the fluctuations that occur throughout the day，" Holt-Lunstad said.

Overall， happily married people scored four points 59_______ on the blood pressure readings than single adults. The study also found that blood 60_______ among married people- especially those in happy marriages—— 61_______ more during sleep than in single people.

"Research has shown that people whose blood pressure remains high" throughout the night are at 62_______ greater risk of heart disease than people whose blood pressure drops，" Holt-Lunstad said.

The study was published in the March 20 63_______ of the joumal Annals of Behavioral Medicine.

The study also found that unhappily married adults have higher blood pressure than bothhappily married 64_______ single adults.

Holt-Lunstad noted that married couples can encourage healthy habits in one 65_______ ， such as eating a healthy diet and having regular doctor visits. People in happy marriages also have a source of emotional support， she said.

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A.from

B.to

C.than

D.by