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One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

14.DS型苗的遗传物质为DNA,培养R型菌中加入蛋白质或英膜多糖后无法完成转化,A正确;提取的S型DNA纯度高,转化效率高,B正确,DNA聚合酶不会催化S型菌DNA的水解,DNA仍能起作用,C正确;S型细菌丢失荚膜后变成的“R型菌”,遗传物质并未发生改变,感染小鼠后增殖仍然是S型菌,会使小鼠患败血症,D错误