将9个（含甲、乙）平均分成三组，甲、乙分在同一组，则不同分组方法的种数为[ ]
A．70
B．140
C．280
D．840
答案：A
One of the differences between the Pacific Ocean and the Indian Ocean is that the former has______waves.
A．largest
B．large
C．larger
D．the largest
二氯氧锆-枸橼酸试剂可以区别（）
A.黄酮和异黄酮
B.黄酮和二氢黄酮
C.羟基黄酮和不含羟基黄酮
D.3-羟基黄酮和5-羟基黄酮
E.邻二酚羟基黄酮和无邻二酚羟基的黄酮
