Prática de Shadowing: PTE Retell lecture test 1 - Aprenda a falar inglês com vídeo
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In today's lecture I'm going to talk about changes in air pollution since the middle of the last century
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and what has created these changes.
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So by the 1950s air pollution was very visible with frequent
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thick black fogs known as smogs in many large cities around the world.
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The main source of this pollution was from factories and it caused severe health problems.
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For example, a particularly severe smog in London in 1952 caused over 4,000 deaths.
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Obviously, something had to be done.
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And in 1956, a Clean Air Act was introduced in Britain.
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This addressed the pollution from factories and the smog soon disappeared.
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However, as you know, these days air pollution is still a big issue.
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The main difference between now and the 1950s is that you can't see it, it's invisible.
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Also, the main source of pollution now is from cars and lorries, and although these don't produce visible signs, this air pollution is still a significant risk to health.
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And one of the key factors in the rise of this type of pollution is
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that we have all become much more vehicle dependent.
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There are far more cars and lorries, trains and planes than in the 1950s, and this is now the main source of air pollution around the world.
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Sobre esta lição
Você está praticando inglês com "PTE Retell lecture test 1" usando a técnica de Shadowing.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.