B. It can help guide future efforts to protect endangered plant-life.

　　C. It can provide directions for where to look for other ancient plants.

　　D. It proves that all plant life can survive for thousands of years when frozen.

　　【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

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