问题描述：
Put your hand to the left side of your chest.Try to feel your heat beating.The heart takes
Put your hand to the left side of your chest.Try to feel your heat beating.The heart takes a little r___ after each beat.In boys or girls of y___ age,the heart beats about 90 times a minute.A grown-up's heart beats a___ 70 or 80 times a minute.But the heartbeat is different in the s___ person at different time.For example,the heart beats faster during exercise.It is also faster when a person is angry,scared or excited.During s___ ,the heartbeat slows down.
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Put your hand to the left side of your chest.Try to feel your heat beating.The heart takes a little r___ after each beat.In boys or girls of y___ age,the heart beats about 90 times a minute.A grown-up's heart beats a___ 70 or 80 times a minute.But the heartbeat is different in the s___ person at different time.For example,the heart beats faster during exercise.It is also faster when a person is angry,scared or excited.During s___ ,the heartbeat slows down.
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