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1. Swans, noted for graceful movements in the water, have been the subject of many poetry, fairy tales, legends, and musical compositions.(1)____
译文：天鹅，以其在水中的优雅动作闻名，成为许多诗歌、童话、传说以及音乐作品的主题。
2. At night the desert floor radiates heat back into the atmosphere and the temperature may be drop to near freezing.(2)____
译文：晚上沙漠地面将热气反射回大气中，气温可能降至结冰点附近。
3. A thousand miles no longer mean much to us today for modem jets can easily get us over this long distance within a matter of a few hours.(3)____
译文：1000英里现在对我们来说不算什么了，因为现代喷气机能轻易地在几小时内把我们送到这么远的距离。
4. To stay warm in cold weather, cold-blooded animals must expose itself to a source of warmth such as direct sunlight.(4)____
译文：为了在严寒的天气中保暖，冷血动物必须将自已暴露于热源中，例如直接的阳光照射。
n. 发源地，来源，原始资料
