A．The working hurt are more concentrated in hazardous industries or occupations.
B．The working injuries are often connected with the gender.
C．Older workers are more likely to get hurt at work.
D．Over half of the injuries found at work have something to do with too long working hours.

A．They are built to produce more fruits and wheat.
B．They are naturally air-conditioning and water-saving houses.
C．Most of green houses are used only in winter for heating.
D．People try to save energy as much as possible.