【单选题】What impact can mobile phones have on their users' health? Many people worry about the supposed ill effects caused by radiation from handsets and base stations, despite the lack of credible evidence o...
A.
That cell phones are harmful to people's health is unconvincing.
B.
Cell phones can bring more benefits to people than harm.
C.
People won't worry about the harm cell phones do any longer.
D.
There are only three types of benefits cell phones bring us.
【单选题】Forecasting human resource requirements necessitates making predictions about both the supply and demand of human resources. Which of the following is not a method used to forecast the demand for huma...