题目

One day while driving from my home to work, I noticed a car in front of me had a wobbly(不稳定的)wheel. It was clear that the wheel had been changed recently and had not been fixed correctly. On a slow road this would not show much of a problem but 1 knew a highway was coming soon. There the traffic would move much faster and the driver would be in danger 25 the wheel could come off at that speed.I was driving a large jeep at the time and the car in front was a small one driven by a young lady on her own. So as I tried to flash (闪) my lights and wave her to pull over, I was worried that 下列有关生物实验的叙述中，正确的是（ ）A. 鉴定可溶性还原糖的斐林试剂甲液和乙液与用于鉴定蛋白质的双缩脲试剂A液和B液，虽然其成分相同但用法和用量均不相同B. 用甲基绿和吡罗红对人口腔上皮细胞进行染色，发现细胞核呈红色、细胞质呈绿色C. 叶绿体色素的提取和分离实验中，层析分离后得到四条色素带，其中呈蓝绿色的是叶绿素bD. 观察植物细胞的质壁分离和复原实验中，用KNO3溶液代替蔗糖溶液现象会更明显