单项选择题
A．Americans are forced to be efficient against their will B．Americans should do what they are willing to do C．people ought not to work so hard for efficiency D．Americans are at a loss what to do
A．workers often got iii because of the poor working conditions B．companies were free to put out any products they wanted to C．many people were killed by the dangerous products D．industries were not as careful in management as they are today
A．there was not enough food there in the winter B．there were too many birds C．there were too many glaciers D．there was too much daylight