单选Which of the following property would thermoplastic elastomer have over natural rubber and synthetic rubber（）
A High elasticity
B Good resilience
C Recyclability
D Oil resistance
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In comparison with PE,__ is or are correct（）
A. Nylon has a higher degree of crystallinity, and a higher melting point
B. Nylon has a higher degree of crystallinity, and a lower melting point
C. PVC and PAN have higher degrees of crystallinity, and higher melting points
D. PVC and PAN have lower degrees of crystallinity, and lower melting points
Most polymers are flammable in their pure form, except___（）
A. Polystyrene
B. Poly（vinyl chloride）
C. Polytetrafluoroethylene
D. Polyimide
Natural rubber is a kind of（）
A. Thermoplastic polymers
B. Thermosetting polymers
C. Unsaturated polymers
D. Saturated polymers
The fundamental reactions involved in addition polymerization are ______（）
Addition to double bond and generation of a primary radical
B. Decomposition of initiator and transfer to initiator radicals
C. Initiation, propagation, transfer and termination
D. Initiation, propagation and termination
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