聚合物分子有三种结构形态,即()。
A、线型、支链型、体型
B、短链、长链、特长链
C、直链、支链、环链
D、单键、双键、三键
参考答案:A
I like winter best, because winter is ______ season of the year. [ ]
A. the best
B. the better
C. the good
D. good