剑桥雅思17Test3Part4听力答案解析 Bird Migration Theory
剑桥雅思17听力第三套题目第四部分由10道提纲型填空题组成。除了第36题定位比较困难，第40题拼写比较困难之外，其他题目的难度都还可以接受，属于考试中偏简单的类型。下面是具体每道题目的答案解析。
点击查看这篇雅思听力中出现的常考词汇与对应的录音原文：
剑桥雅思17Test3Part4听力高频词汇 Bird Migration Theory
剑桥雅思17Test3Part4听力原文与答案 Bird Migration Theory
剑桥雅思17 Test3 Part4听力答案解析
第31题答案：mud
对应原文：Another theory for the regular appearance and disappearance of birds was that they spent winter hidden in mud till the weather changed and food became abundant again.
答案解析：听到another theory（对应题干上的or）意识到答案即将到来，空前介词in原词出现，根据修饰关系锁定答案为mud。
第32题答案：feathers
对应原文：He observed that in the autumn, small birds called ‘redstarts’ began to lose their feathers
答案解析：听到autumn意识到答案即将到来，空前修饰词loss与lose词性替换，很容易锁定答案为feathers。
第33题答案：shape
对应原文： These assumptions are understandable given that this pair of species are similar in shape
答案解析：听到assumptions意识到答案即将到来，空前修饰词similiar原词出现，甚至句子语序都没有任何改变，很容易锁定答案为shape。
第34题答案：moon
对应原文：Charles Morton, in the seventeenth century. He wrote a surprisingly well-regarded paper claiming that birds migrate to the moon and back every year.
答案解析：听到Charles Morton和17th century意识到答案即将到来，空前词fly与migrate同义替换，介词to原词出现，由此锁定答案为moon。
第35题答案：neck
对应原文：This particular stork made history because of the long spear in its neck which incredibly had not killed it
答案解析：stork和spear均可提示大家答案即将到来，空前词in its在录音中原词出现，再加上事先可以根据题干猜测出空上应该填某个身体部位，由此确定答案为neck。
第36题答案：evidence
对应原文：This was a truly defining moment in the history of ornithology this article is from laokaya website because it was the first evidence that storks spend their winters in sub-aharan Africa.
答案解析：这道题难度较大。一是没有关键词提示大家答案即将到来，二是空前词there had been no的替换较为灵活。如果当时没有注意到first的话，就只能根据词性锁定几个单词之后再去筛选。
第37题答案：destinations
对应原文：Before this, very little information was available about the actual destinations of particular species
答案解析：little提示大家答案即将到来，空前介词about在录音中原词出现，根据修饰关系，确定destinations为正确答案。
第38题答案：oceans
对应原文：This idea came about because it seemed impossible that small birds weighing only a few grams could fly over vast oceans
答案解析：听到small birds意识到答案即将到来，空前形容词huge与vast替换，根据修饰关系，确定oceans为正确答案。
第39题答案：recovery
对应原文：This is still common practice today and relies upon what is known as ‘recovery’
答案解析：虽然没有明确的关键词提示大家答案即将到来。但题干中词汇的替换都比较明显，depend on对应rely on，called对应known，由此锁定recovery为正确答案。
第40题答案：atlas
对应原文：In 1931, an atlas was published showing where the most common species of European birds migrated to
答案解析：听到1931年意识到答案即将到来，从题干可以推测出空上应该填名词。因为句子结构几乎没有改变，因此很容易锁定atlas，但要拼写出来却不太容易。
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