女士独自进入电梯时，如有男士在场，则不必（）男士，要侧站以防万一。
参考答案：背对
下列家用电器中，可将电能转化为机械能是
A．电视机
B．电风扇
C．电饭锅
D．电熨斗
There are more people who are obese today than 20 years ago.
A. gainfully employed B. upwardly mobile C. excessively overweight D. privately educated
