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【单选题】
下列关于有机物的说法中正确的是（ ）A.
甲苯、葡萄糖和聚丙烯均能使酸性高锰酸钾溶液褪色
B.
在鸡蛋白溶液中加入浓Na 2 SO 4 溶液，蛋白质的性质会改变并发生变性
C.
石油裂解和油脂皂化都有高分子生成小分子的过程
D.
分子式为C 5 H 12 O属于醇类的同分异构体有8种，一定条件下能被氧化成醛的醇有4种
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举一反三
【单选题】—_______________________________ —We have three major divisions Operations, Sales and Marketing, Finance and Administration.
A.
How many departments do we have?
B.
Which division are you in?
C.
Which department shows the best?
【单选题】As vascular plants, trees are organized into three major organs: the roots, the stems, and the leaves.
A.
Y
B.
N
C.
NG
【单选题】There are ______ major periods in the drama of the West.
A.
Four
B.
Five
C.
Six
D.
Three
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