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第6部分：完形填空(第51~65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 World Heart Day Sunday was World Heart Day.The World Heart Federation and its member groups in more than one hundred countries organized the celebrations.The World Health Organization and other United Nations agencies provided support for the(51). World Heart Day was first observed six years(52).Organizers proposed the event as a way to help reduce the spread of heart disease.The World Heart Federation says heart(53)kills seventeen million people each year. The group urges people to be active and have a good,healthy diet.It also warns(54)activities known to increase a persons risk of heart attack or stroke. Some of the warnings are directed at children.The World Heart Federation says about twenty-two million boys and girls under the age of five are obese-severely overweight. Children are normally energetic and active.(55),two thirds of all children are not active enough.Such children greatly(56)their risk of becoming obese.They also increase their(57)of developing heart disease or other disorders. One message of World Heart Day is to eat right.Children(58)eat a healthy and balanced diet.Also,limit sugary drinks,sweets and eating between meals. | 
