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15.Our modern life is changing our eating habits.We are spending too much time in front of TV or computers and(61)becoming(become)"couch potatoes"or"mouse potatoes".We also eat too much junk food and we don't get enough exercise.The foods we find in the supermarket are sometimes no  (62)benifinical(benefit) to us,and it is difficult to know exactly(63)whatwe are eating when we buy ready-made or pre-prepared dishes.Considering this situation,it is becoming(64)more(much) important than ever (65)to make(make) sure that we keep a healthy diet.
    A healthy diet gives us the calories we need and don't contain too much fat.The number of calo-ries we need(66)changes(change) depending on what kind of body we have (are we short,tall,heavy etc.)
and how active we are.Quality food,or healthy food,gives us calories in the best way.Junk food,(67)onthe other hand,gives us few calories and lots of fat and sugar.If we eat too much fat and sugar,we will put on(68)weight(weigh) easily.in order to live(69)ahappy and long life,we should keep a(70)balanced(balance)diet.

分析 本段文字告诉我们,现代化的生活方式改变了人类的生活习惯,现在很多人把大量时间都泡在电视和电脑上,并且经常吃一些垃圾食品而又得不到足够的锻炼.有些时候我们在超市里看到的事物对我们比一定有益处,健康的饮食能提供我们身体所需要的能量,而不会包含过多的脂肪,一个人所需要的能量取决于他的体型和活动量.健康的食物能以最好的方式给人类提供能量,相反,垃圾食品则包含过多的脂肪和糖分,会使人变胖.所以,为了保持健康延长寿命,人们应该保持饮食的平衡.

解答 61.becoming;考查并列结构,这里becoming和前面的spending是并列成分,所以形式要保持一致,用现在分词形式.
62.benifinical;考查形容词,根据句意,空格处用形容词形式作句子的表语.
63.what;考查关系代词,这里what引导宾语从句,在从句中what作动词eat的宾语.
64.more;考查比较级,根据句意,句子中有比较级的关键词than,所以要用比较级,多音节形容词的比较级形式是在单词前面加more.
65.to make;考查动词不定式,结合上下文,空格处用不定式表示目的.
66.changes;考查动词的时态,本文通篇运用了一般现在时,句子的主语是The number,所以这里要用动词的第三人称单数形式.
67.on;考查固定短语,on the other hand是固定搭配,意为"另一方面".
68.weight;考查名词,根据句意,空格处应该用名词形式.weight做动词短语put on的宾语.
69.a;考查不定冠词,这里用不定冠词表示泛指,泛指"一种幸福长寿的生活".
70.balanced;考查分词作形容词,这里用过去分词作形容词,balanced diet意为"健康的饮食".

点评 首先要通读全文,了解大意,抓住上下文语境所提供的信息,仔细分析带空格的句子,明确空格所要填的词义,词型和短语搭配给出所要填的正确形式,然后整体阅读短文,核对答案.

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