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训练13 阅读理解＋阅读填空＋完形填空＋短文改错(建议用时40分钟)Ⅰ.阅读理解(自然环境保护工作者) are unveiling their 12 trees of Christmasation confronting some of the world's threatened conifers(针叶树)．As decorated trees take centre stage in many homes over the festive periodthe world are thought to be threatened with extinction unless immediate action is taken.The social media event is being run by the Global Trees Campaign.On each of the 12 days until Christmas Eve on 24 December，the Global Trees Campaign，a partnership between Botanic Gardens Conservation International (BGCI) and Fauna and Flora International (FFI)，is publishing details of a threatened tree species on social media.“Given that it is Christmas and everyone is bringing conifers into their houses，we think that it is good to highlight some of the other conifer species that are not doing so well at the moment，” explained Emily Beech，BGCI conservation assistant. The development of the global trade in plants，and the demand over the centuries from wealthy families to plant exotic tree species on their land，mean that 80% of the conifers listed as threatened are found in collections around the world.However，these specimens(样本) are unlikely to be enough to ensure the longterm survival of these species. is that a lot of the specimens that are in botanical gardens or are in people's back gardens do not have the genetic range; they are sourced from the same trees，” Ms Beech told BBC News.“As they do not have the genetic diversity，they cannot be reintroduced back into the wild.So if they disappear，then there will be limited genetic resources to put them back again.” | 
