2014
高考英语阅读理解精英定时系列训练题（2）及答案 《湖南省株洲市二中2013二模》c researchers at washington university school of medicine in st. louis have identified a gene that is required for proper development of the mouse ear, providing clues to deafness. in humans, this gene is known as fgf20. “when we inactivated(阻止活动) fgf20, we saw they were alive and healthy,” says senior author david m. ornitz, pro
