题目

D     Andrew Carnegie was a 19th century steel tycoon（大亨）who became one of the 20th century’s most famous philanthropists（慈善家）His life story is one of the most famous rags-to-riches accounts in United States history. Carnegie was born in Dunfermlined, Scotland, on November 25,1835. The son of a weaver, he came with his family to the United States in 1848 and settled in Allegheny, Pennsylvania. At age thirteen, Carnegie went to work as a bobbin（线轴）boy in a cotton mill. He then moved rapidly through a series of jobs with Western Union and the Pnnsylvania Railroad. 5．如图表示物质甲、乙在细胞膜两侧分布情况，下列关于物质跨膜运输的叙述，正确的是（　　）A．甲通过胞吐出胞外一定需要载体B．甲进入细胞一定通过磷脂分子间隙C．乙跨膜进入细胞一定有载体蛋白参与D．乙运出细胞一定需要能量