NaNO2有像食盐一样的外观和咸味,它可将正常的血红蛋白变为高铁血红蛋白,使血红蛋白中的铁元素由二价变为三价,失去携氧能力.
找出不同类的单词,把答案编号写在前面横线上。
① ____ A. red B. yellow C. bag D. blue
② ____ A. doll B. kite C. ball D. pig
③ ____ A. two B. seven C. nine D. hen
When he was ill, he well by his grandma.