单选题：阅读材料，回答题：Many Children's Deaths Preventable: WHOOver five m

阅读材料，回答题：
Many Children's Deaths Preventable: WHO
Over five million children die each year from disease, infections and accidents related ______ (51) their environment although many of these deaths are largely preventable, says theWorld Health Organization.
On Monday, the WHO asked governments and citizens around the world to take action to cre-ate healthy___(52) for children as it celebrated World Health Day.
"The biggest threats to children's health lurk in the very___(53) that should be sa-fest-home, school and community," said Dr.Gro Harlem Brundtland, director-general of theWHO at the day's launch in New Delhi, India.
"Every child has the right to___(54) up in a healthy home, school and community.
The future development of our children--and their world--depends on _______(55) enjoyinggood health now. We have their future in our_______(56). Now we must work more effectivelytogether to _______(57)the risks from the environment which our children face," Brundtlandsaid.
This year's theme, " Healthy Environments for Children" focuses on the many dangers_______ (58) by children in and around the places where they live and play.
These include inadequate access to safe drinking _______ (59)and sanitation, insect-bornediseases, air pollution, chemical hazards and injuries from traffic, falls, bums and drownings.
Communities around the world organized events to promote awareness of children's health is-sues, _______ (60) included drawing contests for schoolchildren in Vietnam, street plays in In-dia, puppet shows in Namibia and professional lectures for policy makers in Germany and else-where.
Activities also took_______ (61) in cities across Canada on Monday, including Calgary,Montreal, Halifax and Ottawa.
Although children under five represent only 10 per cent of the world's population, they bear40 per cent of the global disease _______(62) , says the WHO. And as much as one-third ofthe total burden of disease may be caused by environmental _______ (63).
World Health Day has been celebrated on April 7th_______ (64) 1950. Each year theWHO chooses a theme to highlight areas of particular concern. Last year's_______ (65), Movefor Health, focused on promoting physical activity as part of healthy living.
A．by
B．to
C．on
D．at