To play this video you need to enable JavaScript. Do you have a question you want us to answer? You can send us your questions to [email protected] 1. We can use both present perfect and past ...

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English Bulldog needs ‘new blood’ to improve its health issues Cuckoo migration 'now more perilous' 布谷鸟迁徙路线更加艰险 Episode 160722 / 22 Jul 2016 A study shows that the birds’ migration route is more ...