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I.阅读理解(共11小题;每小题2分,满分22分)-|||-A-|||-Smaller than your fist,your healthy heart just goes on and on.It will beat more than 60 times a minute-|||-for 70 years or more.That`s something that most of us take for granted.But it`s an amazing fact.-|||-60 times a minute for 60 minutes is 3,600 times.What physical thing can most of us do 3,600 times in-|||-one hour? Blink?Maybe.Tap our fingers on the desk?No.Jump up and down?Certainly not! But our-|||-heart keeps beating,hour after hour.Every day,it pumps almost 2,000 gallons of blood through our blood-|||-vessels(血管).It takes you about five years to drink 2,000 gallons of water.-|||-And,unlike your knees or your back,your heart does all this work without ever complaining(抱怨)!-|||-You never know that it`s even there.Your heart is such a reliable"silent partner"that people forget to care-|||-for it.For many,the first indication(迹象that their heart isn`t working properly is a serious heart illness!-|||-Over 650,000 Americans die of some kind of heart disease every year,Cancer kills 560,000,stroke kills-|||-143,000,and accidents kill 118,000 Americans annually.-|||-Like accidental deaths,many heart disease related deaths can be avoided if people simply follow the-|||-advice of the experts.Unfortunately,mos people seem to listen to a little voice in their head that says,"It-|||-won`t happen to me."So these people keep on smoking and drinking.They continue to eat too much meat.-|||-And their only "exercise"is getting off the sofa to get something out of the fridge. Please follow the-|||-following steps to keep your heart healthy.-|||-1.Which of the following physical activities can keep going on and on?-|||-A.Blink. B.Jump. C.Finger tap. D.Heart beat.-|||-2.What do we know about our healthy hearts?-|||-A.Our healthy hearts work with many complains as our knees.-|||-B.Our healthy hearts can pump 3,600 gallons of blood every day.-|||-C.Our healthy hearts are smaller than our fists.-|||-D.Our healthy hearts can beat 60 times in one hour.-|||-3.What do you think the next paragraph is about?-|||-A.Some tips for keeping a healthy heart. B.Some suggestions for avoiding accidental deaths.-|||-C.Some reasons for doing regular exercise. D.Some exercise for keeping a healthy lifestyle.

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