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Blood pressure is the force put on-|||-the walls of the blood vessels with each-|||-heartbeat. Blood pressure helps move-|||-blood (46) your body.It is-|||-often(47) by putting a wide-|||-band called a cuff around your upper-|||-arm. Your pressure is measured as the air-|||-is let (48) of the cuff.Blood-|||-pressure is one number over a second-|||-number.The(49) number is-|||-lower and is called the diastolic reading.-|||-Normal blood pressure is about I20-|||-over 80.Blood pressure (50) -|||-from person to person. Each person`s-|||-A bottom B called-|||-E varies F to-|||-I through I call-|||-blood pressure changed from hour-|||-(51) hour and from day to-|||-day.-|||-High blood pressure is also-|||-(52) hypertension.High-|||-blood pressure is 140 over 90 or higher-|||-The harder it is for blood to flow through-|||-your blood vessels,the(53) -|||-your blood pressure is.With high-|||-blood pressure,your heart is working-|||-harder (54) normal. High-|||-blood pressure can (55) to-|||-heart attack, stroke,kidney failure, and-|||-hardening of the blood vessels.-|||-C lead D out-|||-G than H checked-|||-K higher L from

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The coming of the railways in the 1830s ________ our society and economic life.A. transferredB. transformedC. transportedD. transmitted
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