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高效组合练十九　阅读理解＋完形填空＋读后续写 Ⅰ.阅读理解 A (2019· 山东淄博二模)The world's insects are going down the path of extinction，threatening a “catastrophic collapse of nature's ecosystems”，according to the first global scientific review.More than 40% of insect species are declining and a third are endangered，the analysis found.The rate of extinction is eight times faster than that of mammals，birds and reptiles. “It should be of huge concern to all of us，for insects are at the heart of every food web.They pollinate(授粉)the large majority of plant species，keep the soil healthy，recycle nutrients，control pests，and much more.Love them or 1oathe them，we humans cannot survive without insects，”said Prof Dave Goulson at the University of Sussex in the UK. The analysis，published in the journal Biological Conservation，says intensive(集约型)agriculture is the main driver of the declines，particularly the heavy use of pesticides.Urbanisation and climate change are also significant factors. “If insect species losses cannot be stopped，this will have catastrophic consequences for both the planet's ecosystems and for the survival of mankind.It is very rapid.In 10 years you will have a quarter less，in 50 years only half left and in 100 years you will have none，”said review author Francisco Sánchez­Bayo，at the University of Sydney，Australia. One of the biggest impacts of insect loss is on many birds，reptiles，amphibians and fish that eat insects.“If this food source is taken away，all these animals starve to death，”he said.Such effects have already been seen in Puerto Rico，where a recent study revealed a 98% fall in ground insects over 35 years. Matt Shardlow，at the conservation charity Buglife，said：“It is thoughtful to see this evidence that shows the pitiful state of the world's insect populations.It is increasingly obvious that the planet's ecology is breaking and there is a need for a strong and global effort to prevent and change these terrible trends.” [语篇解读]　本文是一篇说明文。文章讲述的是，昆虫数量的减少正在破坏自然生态系统。 1．Why are peo