雅思入学测试题(6.5高分班)
At DuPont, researchers have used both yeast and bacteria as hosts to grow the raw material, which they have spun into fibres. Robert Dorsch, Dupont’s director of biochemical development, says the globules of protein, comparable with marbles in an egg, are harvested and processed.【资料下载】雅思入学测试题(6.5高分班)
