Plastics are materials……

A、Theword"sympathetic"inp……答案：agreeable
B、Itcanbeconcludedfrom……答案：plasticsarecheapasantiques
C、Whichofthefollowingis……答案：Carbon.
D、Plasticsthathardeninto……答案：thermosetting
E、Whichofthefollowingis……答案：TheDevelopmentofPlasticsasaModernMaterial.