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  3. The reason fruits and vegetables are so important to your overall health is

The reason fruits and vegetables are so important to your overall health is

游客2024-04-20  43
问题     The reason fruits and vegetables are so important to your overall health is that they are major purveyors of antioxidants.
    Antioxidant molecules are like the missile【C1】______system of your body, preventing damage from molecular bombs called free radicals. It works like this: in order to breathe, move, or eat, your body’s cells【C2】______food and oxygen into energy. This chemical reaction releases【C3】______byproducts, the free radicals we mentioned. Basically, they’re highly reactive【C4】______of oxygen that are missing an electron.【C5】______for that missing electron, they steal them from normal cells, damaging the healthy cell and its DNA in the【C6】______This damage eventually【C7】______to any number of major health problems, including heart disease, memory loss, and cancer.
    Antioxidants, however,【C8】______with this process by giving free radicals one of their own electrons to stabilize them. Or they combine with free radicals to form different, more【C9】______compounds. There are also antioxidant enzymes that help free radicals react with other chemicals to produce safe, instead of toxic, substances. Antioxidants, for instance, help prevent "bad" LDL cholesterol from becoming【C10】______and forming plaque(斑). This is the reason the health establishment is so insistent on people eating more fresh produce: It provides around-the-clock defenses against free-radical damage to your arteries.
A)change B)contributes C)convert D)defense E)Desirous
F)Desperate G)forms H)harmful I)interfere J)offense
K)participates L)process M)stable N)stickier O)thinner [br] 【C2】
选项
答案 C
解析 该空格前为名词body’s cells，空格后为并列短语food and oxygen，因此填入该空格的词应为动词。根据句意及上下文语义关系可知，此处所选单词应表示“转换”之意，选项中A、C两项都有转变的意思，二者的区别在于change通常指形式、形态上的变化，而convert一词则指事物本质上的改变，此处“把食物和氧气转化为能量”是本质上的改变，所以C是最佳答案。
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