RL是PTE口语中比较让人头疼的几大魔王之一，

不但考了PTE 口语，还要考PTE听力。

同学们可以回顾一下往期的RL高频新题，

让同学们上PTE战场上时更有自信。

往期链接：

一:Sugar

二:Shy fish

三:New App

四:Music and well-being

五:Smell of the library

六:Dropping birth rate

七:Chest x-ray

八：Animal behavior

九：American literature

十: Morton prince

十一：Taxonomy

十二：First robot

New rice

主要内容介绍：

这段录音主要阐述了关于转基因rice

是如何从1960年至2000年发展起来的，

提到了墨西哥的green revolution

和转基因大米种植的起因。

提到了几种不同的转基因大米种类。

笔果还原听力原文：

In 1943, what became known as the green revolution began when Mexico, unable to feed its growing population, shouted for help. Within a few years, the Ford and Rockefeller foundations founded the international rice research institute in Asia. And by 1962, a new string of rice called IR8 was feeding people all over the world. IR8 was the first really big modified crop to make a real impact on world hunger. In 1962, the technology did not get exist to directly manipulate the genes of plants. And so IR8 was created by carefully crossing existing varieties, selecting the best from each generation, further modifying them and finally finding the best. Here is the power of modified crops: IR8 with no fertilizer, straight out of the box, produced five times the yield of traditional rice varieties. In optimal condition, with nitrogen, it produced 10 times the yield of traditional varieties. By 1980, IR36 resisted pasts and grow fast enough to allow two crops a year instead of just one, doubling the yield. And by 1990, using more advanced genetically manipulation techniques, IR72 was outperforming even IR36. The green revolution saw worldwide crop yield explode from 1960 through 2000s.

听力词汇/词组：

Retell lecture要点：

1. 描述这段录音的主要内容：

关于转基因大米。

The speaker mainly talked about the genetically modified rice and its development.

2. 描述转基因大米出现的契机和第一类大米：

The speaker mentioned the green revolution in Mexico and world hunger have contributed to the development of genetically modified rice. By 1962, a new string of rice called IR8 appeared. IR8 was created by crossing existing varieties and could produce 5 times more than traditional rice without any fertilizer and 10 times with nitrogen.

3. 描述IR36和IR72:

Then, the speaker talked about TR36 which appeared in the 1980s, it enables two crops a year instead of just one. As the techniques improve over the year, in 1990s, IR72 was even outperforming IR36.