社会:避孕药的影响
社会:避孕药的影响In May 1960, the U.S. Food and Drug Administration approved the world’s first birth control pill. Today, 12 million American women take the Pill, making it the leading contrace...
葡萄园的生态平衡(2)
用小羔羊的费用远远低于夏季的七个星期雇工修剪的费用。Mr. Johnson says the young lambs are perfectly designed to do the job. They eat the grape leaves on the lower parts of the vine. But they are n...