为了帮助同学们的托福作文更上一层楼，今天小编就给大家讲讲对比论证在作文中的重要性，希望能对各位有所帮助哦!
对比论证是在无话可说时的救命稻草。特别是要对两件事物进行比较时，我们都可以用对比论证来进行展开，比较有说服力。对比论证通常分为两种：一是具体情况的正反对比，二是过去与现在的对比。根据不同的文章特点，可以将对比论证进行有效应用。
1.两种对比论证综合应用：
简单分析完了正反对比和过去与现在对比的单独应用，并不是说它们只能单独使用，考生们也要学会灵活应用。在一些题目中，两者结合起来使用也是一种很有效的论证方法。尤其在托福作文中，对论证的字数需求会更多，能有效结合也是一种很好的论证模式。
下面我们来看一道托福写作考题：
Choose one of the following transportation vehicles and explain why you think it has changed people’s lives: automobile, bicycles, airplanes. Use specific reasons and examples to support your answer.
The world has been made smaller by airplanes. Compared with other vehicles, airplanes are able to cover great distances in less time. Ancient people may have had to consume several days or even weeks travelling by slower means before arriving at a faraway destination. As a result, our ancestor had very few opportunities to travel to different parts of their country, and world travel was unthinkable. Not everyone was as fortunate as the great traveler Marco Polo. Today, passengers can visit several distant cities within a single day. An increasing number of modern citizens have realized dreams to travel around the globe, and have done so by airplane.
看完考题的出题特点，三选一，那么很自然会想到用对比论证来进行重点分析。范例选了飞机最能改变生活，因为可以缩短世界的距离。先用了正反对比将飞机和其他交通工具进行对比突出它的飞行距离更远。然后再用过去的人出行耗时，而且不能去很远这一状况与现代人可以坐飞机环球旅行进行对比，来突出飞机是最能改变人们生活的。两种论证有效结合，紧扣主题，达到了很好的论证效果。
总之，对比论证应用广泛，也很灵活，比较容易写到字数，考生们可以根据出题特点进行尝试。当然论证方法有很多，考生们要学会分析出题特点，将不同论证方法进行灵活应用。希望以上内容能对各位有所帮助噢!
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