[解析]
(1)B.细节理解题。根据第一段However,the scientists say the organic methods improved the health of the soil and used half as much energy.然而,科学家说有机方法改善了土壤的健康,并且消耗了一半的能源;第三段They found the organic fields were healthier.他们发现有机农田里的庄稼更健康。可知,利用有机方法种植,不但可以改善土壤的健康,而且对人体也是更健康。故选B。
(2)C.细节理解题。根据第三段They grew crops on four fields of land in Switzerland.Two fields were grown using traditional farming methods.The others were grown using organic farming methods.他们在瑞士的四块土地上种庄稼。用传统的耕作方法种植了两块地。其他的都是用有机耕作法种植的。可知,科学家们实施实验是通过使用不同的耕作方法种植,通过比较来得出结果的。故选C。
(3)A.推理判断题。根据第四段The scientists say ...had almost two times as many insects,including helpful insects.科学家说有机土壤中的养分更多。有机田土壤的生物活性也高于其它田。有机田里有更多有益的生物和更多不同的生物。有机土地上的昆虫数量几乎是它们的两倍,包括有益的昆虫。可知,有机土壤的优点在于其养分更多、生物活性更高。所以本段主要谈论了有机土壤的优点。故选A。
(4)B.推理判断题。根据倒数第二段The researchers say the findings show that organic crop production rates change little over time,and that soil fertility increases.They say the finds suggest that organic farmers can help the environment by increasing soil fertility.研究人员说,研究结果表明,有机作物的产量随着时间的推移几乎没有变化,而且土壤肥力增加了。他们说,这些发现表明,有机种植者可以通过提高土壤肥力来改善环境。可知,通过有机种植,可以提高土壤肥力进而来改善环境。由此可知,有机农业是比较环保的。故选B。