【答案】B

　　【解析】细节理解题。根据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. If a plant ever goes extinct, scientists could bring it back by taking its seeds from the Svalbard or other storage lockers.有了这个重要的发现有助于帮助我们未来去保护频临灭绝的植物，故选B。

　　34. The underlined word “they” in the final paragraph refers to _______.

　　A. plants

　　B. seeds

　　C. scientists

　　D. storage lockers

　　【答案】B

　　【解析】词义猜测题。根据If a plant ever goes extinct, scientists could bring it back by taking its seeds from the Svalbard or other storage lockers.able to live for应该指的是种子能够活多长，故选B。

　　35. The purpose of the passage is to _______.

　　A. discuss a plant conservation effort

　　B. introduce some ancient plants

　　C. outline some causes of global warming

　　D. describe a scientific research project

　　【答案】D K

　　【解析】作者意图题。纵观全文的内容可知短文介绍了一个科研项目，故选D。 C

　　As thousands of communities in the USA — especially in the South — became booming gateways for immigrant families from Central and South America during the 1990s and the early years of the new century, public schools struggled with the unfamiliar task of serving the large numbers of English learners arriving in their classrooms.

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