第33题: [单项选择]The underlined word "knives" is used to ______. A. prevent the reel from advancing to rapidly B. twist the wire C. separate doublestranded wire D. cut the wire that becomes barbs 参考答案:D 答案解析:本题为细节推理题。由“The wire to make the barbs is fed into the machine from the sides and cut to length by kn