2017年高考英语三轮复习专练（广东）阅读理解专题4 “顺藤摸瓜”——明辨词义猜测类题目专题训练（含15命题动向）_高考复习指南

2017年高考英语三轮复习专练（广东）阅读理解专题4 “顺藤摸瓜”——明辨词义猜测类题目专题训练（含15命题动向）

　　Amazingly，scientists have just managed to do something very similar.They found the fruit of an ancient plant that had been frozen underground in Siberia—a region covering central and eastern Russia—for about 31,800 years.Using pieces of the fruit，the scientists grew plants in a lab.The new blooms have delicate white petals.They are also the oldest flowering plants that researchers have ever revived from a deep freeze.

　　“This is like regenerating a dinosaur from tissues of an ancient egg，” said Jane ShenMiller，a biologist of University of California，Los Angeles.

　　The plant has a long history.Back when mammoths and woolly rhinoceroses walked on the land，an Arctic ground squirrel buried seeds and fruits in an underground chamber near the Kolyma River in northeastern Siberia.The ground became permafrost，a layer of soil that stays frozen for a long time.

　　Recently，Russian scientists dug out the old squirrel hole and found the plant remains 38 meters below the surface.Back at the lab，the team fed nutrients to tissue from three of the fruits to grow shoots.Then the scientists transferred the shoots to pots filled with soil.The plants produced seeds that could be

　　used to grow even more of them.

　　It's important for scientists to know that plant tissues can still be revived after being frozen for a long time.That's because many researchers are trying to preserve the seeds of modern plants by freezing them and then storing them in giant lockers at various spots around the globe.One such endeavor，an underground facility in Norway，is called the Svalbard Global Seed Vault.It stores hundreds of thousands of frozen seeds.If a plant ever goes extinct，scientists could bring it back by taking its seeds from the Svalbard or other storage lockers.