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许多同学都有晨练的习惯,但是也有一些同学喜欢晚运动。那么,锻炼身体是早上好还是晚上好呢? 其实,这个问题要辩证地去看。我们都知道,锻炼身体能使我们吸入充足的氧气,呼出二氧化碳。而我们呼吸所需要的氧气主要是由植物的光合作用提供的。植物在白天进行光合作用,释放出氧气;在夜晚,植物也和人一样,吸入氧气,排出二氧
Many students have the habit of morning exercise, but some students like late exercise. So, exercise is good morning or good evening? In fact, this issue should be dialectical to see. We all know that exercising allows us to breathe enough oxygen and exhale carbon dioxide. The oxygen we need for breathing is mainly provided by photosynthesis in plants. Plants perform photosynthesis during the day to release oxygen; at night, plants, like humans, inhale oxygen and emit oxygen