思路B：列举的思路

还是以刚才那个题目为例：

Students often like to eat fast foods, especially when they are fairly busy. Can you tell us the advantages and disadvantages of eating fast foods?

刚才我们谈到的是好处，那么不足的地方有没有呢?

同学可能会说常吃快餐易导致营养不良，易导致肥胖，易导致疾病等等。那我们现在就说下一个大家很熟悉的观点: the fast food may easily lead to obesity. 大家用中文或者英文论证20秒，看看怎么样?

所以，你说满时间了么?

如果你没说满，请看看好老师这个段落。

The fast food may easily lead to obesity. For example, many of my classmates like to eat fast foods, such as the French fries, fried chicken, the pineapple pie, the coke and so on, but these foods are really rich in fat and sugar. If eating too many, students may be more likely to get fat.

好老师这里充满20秒的技巧就是列举的论证，这个思路也是你可以展开自己想法的选项之一。类似的思路好老师再聚个例证：

In spare time some students like to learn to master a new sport, while some students like to learn art, which one do you prefer and why?

假设说同学愿意去 learn to master a new sport, 比如说游泳，为啥呢?因为说游泳有助于自己交到更多的朋友，那么好老师展开的选择可以是这样的：

This may help me have more friends. Now all of my friends are just from my own class. If I join in the swimming team in my school, I may have the chance to meet the people from other departments or faculties, such as people from art faculty, history department or chemistry department and so on. Then my friends' circle may be greatly enlarged and I may have more friends.

倘若任性的你既不想用对比对照的思路又不想用列举的思路，那么还有没有第三种选择呢?别急，再来一种。