问题: Thepassageimpliesthat______.
A: itisnoteasytopersuademanufacturerstoadoptthenewdesign.
B:theteamofengineershasnotfoundanycountermeasures.
C:childrenliketoridebicyclesataverylowspeed.
D:alotofchildrenwerekilledinbicycleaccidentsinthepast30years.
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