Return of the elm: reintroducing the beloved tree to Britain - 阅读测试答案

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Nevertheless, opportunities are limited as the number of these mature survivors is relatively small.

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For her, the environmental case for reintroducing elm is strong.

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A first epidemic, which occurred in the 1920s, gradually died down, but in the '70s a second epidemic was triggered by shipments of elm from Canada.

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Strong winds from the sea make it difficult for the determined elm bark beetle to attack this coastal city's elm population.

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Once the trunk of the elm reaches 10-15 centimetres or so in diameter, it becomes a perfect size for beetles to lay eggs and for the fungus to take hold.

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"The effects are very quick," says Russell.

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"Sometimes the best thing you can do is just give nature time to recover... over time, you might get resistance," says Elliot.

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I don't see how it can be entirely down to luck.

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"The beetles can just march in if we're not careful, as the threat is right on our doorstep," says Bourne.

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"You look at old photographs from the 1960s and it's only then that you realise the impact [elms had]..."

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For centuries, elm ran a close second to oak as the hardwood tree of choice in Britain and was in many instances the most prominent tree in the landscape.

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In the 18th century, it was planted more widely and its wood was used for items such as storage crates and flooring.

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It was also suitable for items that experienced high levels of impact and was used to build the keel of the 19th-century sailing ship Cutty Sark as well as mining equipment.