转K6型承载鞍导框挡边内侧磨耗一侧大于（）时须更换。
A、2mm
B、3mm
C、4mm
D、5mm
参考答案：A
The broken bike was found ______ by the riverside.
A．abandoning
B．abandoned
C．to be abandoned
D．being abandoned.
（-1）1000+（-1）1001所得的结果为[ ]
A.0
B.-1
C.-2
D.2
