【单选题】对于有机高分子化合物的说法正确的是:
A.
淀粉和纤维素都可以用(C 6 H 10 O 5 )n表示,因此它们都是高分子化合物并且互为同分异构体
B.
制取聚乙烯、聚氯乙烯和酚醛树脂的反应类型都是加聚反应
【简答题】听短文,回答问题。 1. How did the shop owner (主人) feel when he closed his shop and went home? [ ] A. He felt tired. B. He felt angry. C. He felt excited. 2. What happened (发生) just as he went to bed? [ ...
【单选题】纺织纤维的种类很多,下列几组不同种类的纤维中,()是属于化学纤维类中的再生纤维。
C.
粘胶纤维、铜氨纤维、大豆蛋白质纤维、lyocell
D.
聚酯纤维、聚酰胺纤维、聚丙烯腈纤维、聚烯烃纤维
【单选题】Why does the man sometimes get angry with Ted?
A.
Because he plays the radio too loud.
B.
Because he throws his things around.
C.
Because he often leaves the door open.
D.
Because he comes home late.
【单选题】提出“灭人之国,必先去其史”警言的著名学者是
【单选题】提出“灭人之国,必先去其史”警言的著名学者是