ABS树脂是由哪几种物质共聚而成的？
参考答案：
ABS是由苯乙烯，丁二烯，丙烯腈三元共聚而成的。
The child was _____ of being left alone in the house. Which is WRONG? [ ]
A. terrified
B. afraid
C. frightened
D. terrifying
中 * * 是最高国家权力机关。
