高空作业时，工具应装在工具袋里，不准穿（），不准打闹，不可以上抛物件和工具。
A．软底鞋
B．硬底鞋
C．绝缘鞋
D．布底鞋
参考答案：B
Under the classification system used by the U.S. Bureau of Labor Statistics, which of the following people would NOT be considered unemployed Someone who:（）
A. was terminated from his last job.
B. quit and is looking for new work.
C. is disabled and unable to return to work.
（）的出现标志左翼电影创作进入一个比较成熟的阶段。
A.《狂流》
B.《春蚕》
C.《祝福》
D.《林家铺子》
