— Hi, be careful.— Sorry, ____________。
A. I don't notice
B. I'm not noticing
C. I wasn't noticing
D. I didn't notice
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We learn from this passage that Americans ____________
A. are good at cheating
B. are polite to anybody
C. are sympathetic but honest
D. have no sympathy for others
The manager asked to ____________ the man's address.
A. put on
B. put down
C. put up
D. put off
利用斜面进行装卸作业时，装卸人员应站在斜面的( )。
A. 上方
B. 下方
C. 侧方
D. 上方或下方
下列物质所产生的粉尘中属于有机性粉尘的是( )。
A. 炸药
B. 石棉
C. 水泥
D. 硅石
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