（）是在共同劳动中的规则和秩序，是安全生产的重要保证。
参考答案：劳动纪律
If it is dark, the lights, please.
A．pick up
B．look at
C．turn on
D．play with
The names of the currencies of U. S. A. U. K and Germany are called ______ respectively.
A．US Dollar, Pound Sterling and Deutsche Mark
B．US Dollar, Deutsche Mark and Pound Sterling
C．US Dollar, Guilder and Deutsche Mark
D．US Yuen, Pound Sterling and Deutsche Mark
