剑桥雅思12Test7Section4听力答案解析 The effects of environmental change on birds
剑桥雅思12听力第七套题目第四部分由10道提纲型填空题组成。出题方式都比较符合常规，没有什么刻意设置的障碍。希望大家都能保持一个比较高的正确率。
点击查看这篇雅思听力对应的录音原文与其中出现的需要大家掌握的重点词汇：
雅思备考听力篇 剑12 test 7 section 4 雅思听力高频词汇
剑桥雅思12 Test7 Section4听力答案解析
第31题答案：insects
对应原文： So it’s been known for some time that birds which eat fish may be affected, but what wasn’t known until quite recently is that those that eat insects can also be affected.
答案解析：听到上一行结尾处的fish意识到答案即将到来，空前词feed on与eat同义替换，根据修饰关系确定答案为insects。
第32题答案：behavior
对应原文：she’s looking for more subtle sub-effects. And these may be to do with the behavior of the birds
答案解析：听到人名意识到录音进行到了第二部分，空前词birds’被替换为of the birds，根据所有格关系，确定答案为behavior。
第33题答案：father
对应原文：what you may not know is that a young bird seems to acquire this skill by listening to the songs produced by its father, rather than by any other bird.
答案解析：听到songs意识到答案即将到来，由题干含义（从鸟的什么学习唱歌）可以推测空上应该填某种跟鸟存在亲缘关系的词汇，由此锁定father。
第34题答案：complex
对应原文： if they eat food contaminated with mercury , then the songs they produce aren’t as complex as those produced by other birds
答案解析：听到mercury意识到答案即将到来。录音原文将题干中的比较级替换为not as … as …的形式，由此确定答案为complex。
第35题答案：reproduction
对应原文： because it can mean that they’re less attractive to female birds, and so it can affect their chances of reproduction
答案解析：虽然没有明确的关键词帮助我们定位答案所在句子，但effect与affect的同义替换十分明显，锁定reproduction并不困难。
第36题答案：control
对应原文：The lab-based studies have the advantage that you don’t get all the variables you would in a natural setting. so the experimenter has a much higher level of control
答案解析：听到lab-based studies意识到答案即将到来，空前词more与a much higher level of同义替换，由此确定答案为control。
第37题答案：ducks
对应原文： Well, because many birds are migratory they may be transporting mercury far from contaminated sites. For example, it’s been found that ducks
答案解析：根据migrating与migratory的同义替换意识到答案即将到来，for example与such as对应，由此确定答案为ducks。
第38题答案：language
对应原文：Well, we also know that in humans, mercury causes developmental delays in the acquisition of language
答案解析：听到also意识到录音进行到第38题，acquisition与learning同义替换，由此确定答案为language。
第39题答案：food
对应原文：It’s now known that an unborn child can be affected if the food eaten by its mother contains high level of mercury
答案解析：这道题采用语序颠倒的手法，将原本位于空前的mother放在了答案之后，不过food读的很明显，还是比较不容易错过的。
第40题答案：costs
对应原文：It’s true there are new regulations for mercury emissions from power plants, but these will need billions of dollars to implement, and increase costs for everyone.
答案解析：听到new regulations意识到答案即将到来，increase与空前词affect同义替换，再加上everyone的辅助，由此确定答案为costs。
剑桥雅思12Test7Section1听力答案解析 Public Library
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