短文改错:Nowadays, many studentslike to pursue famous brands. This phenomenon has aroused widely atten-widetion. The following reasons can account on students' preference for famous brands.Above all. in many students'eyes, an famous brand is a symbol of taste. They expect others to admire hishighrclass and good taste. What's more, in modern society, famous brands to some extents are equal to fashionextentand it always appealed to teenagers a lot. I think it is unreasonable for students A pursue famous brandsalsappealBeside, it is not famous brands but a person s noble character that really make him highrclassBesidesmakes

15.A【解析】由图可知,此种发菜在测定的NaCl浓度范围较高时净光合速率<0,不能正常生长,A错误;发菜是蓝藻的一种,属于原核生物,体内无叶绿体,但有能吸收光能的色素,B正确;图中氯化钠浓度在615mol/L时净光合速率最大,故发菜生长的最适NaC1浓度为615mol/L,C正确;随NaCl浓度升高,发菜光合速率和呼吸速率的变化趋势不同,D正确。

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