The sense of delayed gratification, of working now for later pleasure, has helped shape the economic behavior of our society. However, that sense is no longer nurtured as consistently in our children as it once was. For example, it used to take a bit of patience to put together the toys that children got in cereal boxes; now the toys come from the boxes whole. Which of the following is an assumption of the passage above

A．The toys in cereal boxes have changed partly because the economic conditions of our society have improved.

B．The influence of promotion gimmicks on the economic behavior of our society has increased over the years.

C．The toys that used to come in cereal boxes were put together by the same children who played with them.

D．Part of the pleasure of any toy lies in putting the toy together before playing with it.

E．(E) Today’s children do not expect a single toy to provide pleasure for a long period of time.

对学生的选课进行指导主要是班主任的职责和义务，与其他老师关系不大。