建设旅游行业精神文明的关键在于提高旅游从业人员的素质，尤其是（）。
A．思想素质
B．道德素质
C．技能素质
D．职业素质
参考答案：B
---- Did the judge ask you many questions? ---- Yes, and ______.
A．they were difficult to be answered
B．to answer them was to be difficult
C．they were difficult to answer
D．they had difficulty in answering
在起重臂、吊钩、平衡重等（）上应标以鲜明的色彩标志。
A.部件
B.位置
C.构件
D.转动体
