Ancient trees with rich tales can be found across the UK. They are the silent witnesses to the story of these isles that we live

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问题     Ancient trees with rich tales can be found across the UK. They are the silent witnesses to the story of these isles that we live on.
    But how do we know what an ancient tree is? An ancient tree is one which is very old in comparison with other trees of the same species. There is no strict criterion as to what age a tree must be to be considered ancient, but a 600-year-old oak tree or 300-year-old beech tree would qualify. Yew trees can live for several thousand years and oak and sweet chestnut for 1 ,000 years or more.
    From the symbolic and much-loved oak to the majestic beech, trees connect us to our past and will be here for future generations to enjoy. They have provided us with shelter and played a key part in powering the expanding military and fuelling the industrial revolution. They have played a key part in our history. It was under a yew tree at Runnymede in Berkshire that the Magna Carta was signed. A flower of Kent apple tree in the grounds of Woolsthorpe Manor in Lincolnshire proved decisive in Sir Isaac Newton’s theory of gravity.
    In many ways they are taken for granted. Unlike our built heritage with its listings status and preservation orders, ancient trees have no such protection. They remain potentially vulnerable to damage and neglect. The National Trust is currently carrying out an audit of all its ancient trees, thought to number around 40,000 in England, Wales and Northern Ireland. This data will then be fed into the Ancient Tree Hunt which will provide us with, for the first time ever, a clear picture of where these titans of nature can be found.
    This island really is a superpower when it comes to its ancient trees. We escaped the ravages of conflict that blighted mainland Europe in the 20th century and many of our older trees have survived the race to modernise. It’s hard to imagine our countryside without these wise old trees.
Stand next to any ancient tree and you get that sense of wonder at the sights and sounds it will have witnessed down the generations. They provide a sense of reassurance, majesty and power. These trees have been the centre of communities down the ages as places to gather and their loss is something that affects everyone.
    There is something really special about ancient trees which captivates and intrigues us. Capturing these wonders of the natural world on camera has endless possibilities. Their location and prominence in the landscape can create moody and atmospheric pictures. Whether they are in a church yard, one of many in parkland or isolated in a farmer’s field. Close-up shots will find a deeper meaning in their bark and the creatures, such as beetles and woodpeckers that call them home or the fungi and lichen that cling to their trunks and branches.
Different trees are mentioned in Paragraph Two as examples to

选项 A、set a criterion as to what are ancient trees.
B、introduce the rich species of ancient trees.
C、compare different kinds of ancient trees.
D、explain the definition of ancient trees.

答案D

解析 推断题。第二段中所举的例子应是用于说明该段主旨句,而本段的主旨句可以认为是首句,即要解释何为古树。接着第二句进行了简要的定义,可见该段的中心意思就是要给古树下定义,其后的例子是对定义进行解释说明,故[D]为答案。第三句前半句已经明确指出There is no strict criterion“没有严格的标准”,故排除[A];[B]项“介绍丰富的古树种类”和[C]项“比较不同的古树品种”均与段落主旨句无关,因此也应排除。
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