专题02 阅读理解-冲刺2023年中考英语必考题型终极预测（深圳专用）

冲刺2023年中考英语必考题型终极预测（深圳专用） 专题02 阅读理解 （2022·广东·深圳市南山外国语学校（集团）二模） A pair of tusks (长牙) is usually an advantage for elephants, allowing them to dig for water, peel bark (剥树皮) for food and protect themselves. But because of illegally hunting, those big tusks may invite danger. Now researchers are working out how years of civil war and hunting in Mozambique have led to a greater number of elephants that will never develop tusks. During the war from 1977 to 1992, fighters on both sides killed elephants for ivory to provide fund for the war. In the Gorongosa National Park, around 90% of the elephants were killed. The survivors shared a key feature: half the females were naturally tuskless — they simply never developed tusks — while before the war, less than a fifth lacked tusks. More confusing, two-thirds of the new-born elephants were female. Like eye color in humans, genes (基因) are responsible for this. They found that the mothers have produced the smoking-gun genes for genetic changes. The