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急求一篇英语作文!两个题目任选一,exercise can result in iron loss或者physical

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急求一篇英语作文!
两个题目任选一,exercise can result in iron loss或者physical activity has a positive effect on mental functioning字数150左右,不需要特别华丽的词汇,可能会有加分的…
下面这篇两个题目都适用.
All of us know that exercise is good for our health.Regular exercise can help protect you fro-
m heart disease and stroke,high blood pressure ,obesity,back pain,osteoporosis and can improve
your mood and help you to better manage stress.Exercise may power up the brain besides stveng-
thening the heart and lungs,bones and muscles .A succession of scientific studies of animals imp-
lies that physical activity has a positive effect on mental functioning.
Of course ,everything has its contradictory.However,few are aware of the fact that one of
the result of doing exercise is iron loss.Exercise can result in iron loss for the following reasons .
One is that some iron is lost in sweat produced in the exercise .Another reason is blood leaking.
Besides ,exercise may reflect on bruise.
In a word,exercise may do us good but also harm.So,moderate exercise is necessary,but
you should pay attention to some problems when you dou some exercise .
Certainly,in my opinion ,doing more exercise may have unexpected benefits,as long as you have health-conscious.