Why were the Americans in 1910 thinner than today Because they worked ( )physically.

A．Taking long business trips.
B．Working on weekends.
C．Having work experience.
D．Living in the company’s dormitory.

A．They got a wrong order number from the caller.
B． They failed to deliver the computers on time.
C． They couldn’t find the order form.
D．They made a wrong delivery.