At the start of the 20th century，an American engineer named John Elfreth Watkins made predictions about life today.His predictions about slowing population growth，mobile phones and increasing height were close to the mark.But he was wrong in one prediction：that everybody would walk 10 miles a day.
   Today，in Australia，most children on average fall 2，000 steps short of the physical activity they need to avoid being overweight.In the early 1970s，40 per cent of children walked to school，while in 2010，it was as low as 15 per cent.
   The decline is not because we have all become lazy.Families are pressed for time，many with both parents working to pay for their house，often working hours not of their choosing，living in car-dependent neighborhoods with limited public transport.
   The other side of the coin is equally a deprivation：for health and well-being，as well as lost opportunities（機會）for children to get to know their local surroundings.And for parents there are lost opportunities to walk and talk with their young scholar about their day.
   Most parents will have eagerly asked their child about their day，only to meet with a "good"，quickly followed by "I'm hungry".This is also my experience as a mother.But somewhere over the daily walk more about my son's day comes out.I hear him making sense of friendship and its limits.This is the unexpected and rare parental opportunity to hear more.
   Many primary schools support walking school-bus routes（路線），with days of regular，parent-accompanied walks.Doing just one of these a few times a week is better than nothing.It can be tough to begin and takes a little planning-running shoes by the front door，lunches made the night before，umbrellas on rainy days and hats on hot ones-but it's certainly worth trying.

（1）Why does the author mention Watkins' predictions in the first paragraph？

B

B

A．To make comparisons.
B．To introduce the topic.
C．To support her argument.
D．To provide examples.
（2）What has caused the decrease in Australian children's physical activity？

C

C

A．Plain laziness.
B．Health problems.
C．Lack of time.
D．Security concerns.
（3）Why does the author find walking with her son worthwhile？

D

D

A．She can get relaxed after work.
B．She can keep physically fit.
C．She can help with her son's study.
D．She can know her son better.