气瓶充装后，充装单位必须按规定在气瓶上粘贴警示标签和（）。
A、充装单位名称
B、充装标签
C、检验单位名称
参考答案：B
. __ many times, but he still wouldn't listen.
A．Having told
B．Having been told
C．He having been told
D．He was told
服装色彩设计的基本要素包括年龄、面料质地、（）和季节气候。
A.季节气候
B.体形特征
C.年龄
D.面料质地
