本文主要是从历年的新托福口语中为大家总结了常考托福口语题型，大家确定方向，找准考点。下面，我们就看一下“生物类”的新托福口语题型，希望对大家有所帮助。 

托福口语回顾：

【讲课要点】：生物学理论: plant invasion. 一种新树到新的ecosystem中会destroy the ecosystem

【举例说明】：

1. 一种树，本来是来解决问题的，问题是解决了，但是造成了新问题：来了后，长得太高了，导致其他树晒不到阳光了

2. 一种树，非常attractive，但是use lots of water, other trees can not survive。.

参考范例：

The lecture tells us that plants can be totally harmless most of the time. But when inappropriately brought into an environment, plants can also cause disasters by breaking ecological balance in local areas, which is biologically identified as plant invasion. Then the professor goes on to explain that by giving two examples. One is that a tree was introduced into South Africa for the purpose of stabilizing the local sand dunes. The tree fulfilled its task very successfully, but the bad news is that the tree grew so tall that they left very little sunlight for their neighboring plants. Threatened by this intruder, many plants started to lose their former territory. Another example is about a tree which was brought into Western United States for its good appearance. It seems not so large, but it has very developed root system, so it absorbed twice the water as other plants of similar size. Also, it reproduced very fast. With its rapid growing, many other local plants gradually died out because of lack of essential water resource.

在这场关于生物学的讲座中，professor通过以两种不同特点的树为例，解释了生物学理论: plant invasion。

通过以上的一些比较热门的新托福口语范例，同学们应该可以发现，现象+举例式讲座在考试中所占的高比例，所以建议考生们在练习相关题目的时候，多多注意积累，以方便应付各式此类的问题。