问题
单项选择题
当作业者的工作平台高于地面（）时，或为保证作业者远离危险部位时，都应该设计合理的护栏以保证作业者的安全。
A.1m
B.2m
C.3m
D.4m
答案
参考答案：B
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当作业者的工作平台高于地面（）时，或为保证作业者远离危险部位时，都应该设计合理的护栏以保证作业者的安全。
A.1m
B.2m
C.3m
D.4m
参考答案：B
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| Mike didn't hand in his homework on Monday morning. He told Mr. Black that after he had breakfast on Sunday, he had a trip with Michael. They had been walking from eight to eleven. Then they had lunch in a country restaurant for two hours. In the afternoon, when he was ready to do his homework, Bob came and asked him to watch an opera. It began at four and ended at six. After he had supper, he listened to music with his MP3 player from seven to eight. Then he turned on the TV, and watched a new TV show. When the show was over, it was already eleven o'clock. He was too tired to do his homework.
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