Remember to take a breath of fresh air and have some exercise each day. It will make difference.
A. /；a
B. the；a
C. /；the
D. a；the
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(答案→)A. /；a
B. the；a
C. /；the
D. a；the
解析：考查冠词。不可数名词前不加冠词，不定冠词a/an修饰可数名词，表泛指，意为“一个，某个”；定冠词the表特指，意为“这个，那个”。air不可数，breathe fresh air呼吸新鲜空气；make a dofference产生影响，是固定搭配。故选A。