100个句子记完7000个英语单词——俞敏洪(最新完整(4)

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　　 66. Not only can walking fish live out of water, but they can also travel short distances 66.鲇鱼不仅可以离开水存活，还可以在岸上短距离移动。 　　 67. Scientists do not know why dinosaurs became extinct, but some theories postulate that 67.科学家不知道恐龙为何绝种了，但是一些理论推断是地理，气候和海平面的变化造成的。 　　 68. The science of horticulture, in which the primary concerns are maximum yield and super68.主要目的在于丰富和优质的农艺学利用了其他科学的知识。 　　 69. Snow aids farmers by keeping heart in the lower ground levels, thereby saving the seed69.雪对农民是一种帮助，因为它保持地层土壤的温度，使种子不致冻死。 75.北美秃头鹰的数量一度很多，但在近四十年中全北美的秃头鹰数量急剧下降。 　　 76. The beaver chews down trees to get food and material with which to build its home. 76.水獭啃倒树木，以便取食物并获得造窝的材料。 　　 77. Poodles were once used as retrievers in duck hunting, but the American Kennel Club doe77.长卷毛狗曾被用作猎鸭时叼回猎物的猎犬，但是美国Kennel Club却不承认它们为猎犬，因为它们现　　 78. As a result of what is now know in physics and chemistry, scientists have been able to78.物理学和化学的一个成果是使得科学家们能在生物学和医学上获得重大发现。 　　 79. The practice of making excellent films based on rather obscure novels has been going o