题目

Long ago, Bluebird’s feathers were the colour of dust. She did not like her ugly colour. She was attracted by the colour of the lake near her home. It was as blue as the sky after a storm. Bluebird wanted to be the colour of that beautiful lake very much. Flapping her wings one morning, Bluebird flew from her tree to the blue lake. Then she bathed in the water three times. After each bath, she sang, “Blue water. Still water. I went in. I am blue.” Bluebird repeated this every morning. On the third day, she came out of the lake with beautiful blue feathers.Now Coyote was a trickster(骗下列叙述I和II均正确且具有因果关系的是（　　）编号叙述I叙述IIA金属活动性铜比铁弱镀铜铁制品表层划损后仍然受到保护B金属钠有还原性用金属钠检验无水乙醇中是否含有少量水CKsp（CaCO3）＜Ksp（CaSO4）用Na2CO3溶液和盐酸除水垢CaSO4DCl2具有漂白性用氯气制盐酸 A、AB、BC、CD、D