【单选题】Questions 26 to 30 are based on the following passage.
Exercise is one of the few factors with a positive role in long-term maintenance of body weight. Unfortunately, that message has not gotten thro...
A.
they think it is physically exhausting
B.
they find it hard to exercise while on a diet
C.
they don’t think it possible to walk 3 miles every day
D.
they find consulting caloric-expenditure charts troublesome