托福综合写作例文解析TPO.docx

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托福综合写作例文解析TPO 21
摘要： 托福综合写作例文解析TPO 21，同学们，如果你觉得你对托福写作考试没有什么把握，尤其是综合写作部分，感觉不知道如何下手，不知所措，那么或许如下的托福综合写作例文解析能够给你以启示。

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Genetic modification, a process used to change an organism’s genes and hence its characteristics, is not being used to improve trees. Through genetic modification, it

is possible to create trees that produce more fruit, grow faster, or withstand adverse conditions. Planting genetically modified trees on a large scale promises to bring a number of benefits.

基因改良是通过改变有机体的基因，进而改变其性状的过程。目前还没有用来改 良树木。通过基因改良，可能创造出具有产量高、生长快、抗逆强特点的树木。 很大程度上，种植基因改良树木可以带来诸多益处。

First, genetically modified trees are designed to be harder than nature trees; that it, they are more likely to survive than their unmodified counterparts. In Hawaii, for example, a new pest-­‐resistant species of papaya tree has been developed in response to ring-­‐spot virus infections that have repeatedly damaged the native papaya-­‐tree population. Planting the genetically modified papayas has largely put an end to the ring-­‐spot problem.

首先，基因改良树木设计得比天然树木更能承受不良环境。也就是说，相对于它 们没有改良的同类，它们更易存活。比如，在夏威夷有一种新的抗虫害的番木瓜 树。这种树可以抵抗环斑病毒的感染，而正是这种环斑病毒常常会降低当地番木 瓜树的数量。种植这种基因改良的番木瓜可以很大程度上解决环斑病毒的问题。

Moreover,