52．B 　细节理解题。根据第三段可知，作者改变是因为看到了峡谷的美丽景色。故B正确。

　　53．B 　细节理解题。根据第四段中的第一句“Now, I … write down a special thought or feeling.”可知，现在作者在日记里只记录特殊的思想和感情。

　　54．A 　细节理解题。根据最后一段可知，作者意识到要想过有意义的生活得自己亲自去经历。故A正确。

　　阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

　　Superman had it right: if you want to keep something safe, build a mountain fortress (堡垒)above the Arctic Circle. That’s the thinking ---more or less---behind the Svalbard Global Seed Vault（地窖）. Almost every nation keeps collections of native seeds so local crops can be replanted in case of an agricultural disaster. The Global Seed Vault, opened on the far-northern Norwegian island of Spitsbergen, is a backup for the backups. It’s badly needed---as many as half the seed banks in developing countries are at risk from natural disasters. The vault can hold up to 4.5 million samples, which will be kept dry at about -18°C. Even if the facility(设施) loses power, the Arctic climate should keep the seeds alive for thousands of years.

　　On an unusual old farm in New York City, workers are also storing away the seeds of the future. In this unlikely place, researchers are putting the seeds from flowering plants and trees in a sleeplike state called suspended animation (假死状态). Many years from now, other workers will wake up the sleeping seeds and plant them where they're most needed. These seeds are like the legendary (传说中的)

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