在血红蛋白的整个提取过程中，不断用磷酸缓冲液处理的目的是

题干

A：防止血红蛋白被氧气氧化

B：血红蛋白是一种碱性物质，需磷酸中和

C：磷酸缓冲液会加速血红蛋白的提取过程

D：让血红蛋白处在稳定的pH范围内，维持其结构和功能

上一题下一题 0.0难度选择题更新时间:2019-08-17 10:48:15

D

听第一篇短文，回答小题。请根据内容选择正确答案，完成信息记录表。

Visit to Mauritius(毛里求斯)
Country	Mauritius is an island country with ⑴ around it.
Sports	Beach volleyball, fishing and swimming
The most beautiful moment	When you enjoy the beautiful ⑵ and clear seas, you may think you are in the heaven.
Language	⑶

⑴____ A. sea. B. mountain C. river

⑵____ A. sunshine B. sunrises C. sunsets

⑶____ A. English, French and German

B. English, Chinese and Japanese

C. English, French and Japanese