泡沫塑料以所用树脂不同，有（）等多种。
A.聚苯乙烯泡沫塑料
B.聚氯乙烯泡沫塑料
C.聚氨酯泡沫塑料
D.脲醛泡沫塑料
参考答案：A, B, C, D
Maggie and Stella _____new here. They ____listening to music.
A．are both; both like
B．both are; like both
C．are all; all like
D．all are; like all
太极拳劲和力怎样分别？
