3．D　解析：细节理解题。根据最后一段中的“such as protection ...sanitation”和“Increasing disease control efforts”可知A、B、C三项正确。由“for people in the most vulnerable developing countries”可知，D项错误。

　　4．A　解析：主旨大意题。根据文章内容可知，B、C、D项均是文中某一方面的内容，比较片面，A项最能概括文章大意。

　　B

　　(2015·银川高三质检)A campaign is being launched to encourage children to give up 30 minutes of screen time a day to head for the great outdoors to experience the wonders of the wilderness.

　　The newly formed Wild Network—a cooperation of nearly 400 organizations—is attempting to attract youngsters away from television and computer screen and into fields，woods and parks.Organizers say it is the UK's biggest ever campaign to reconnect children with nature and outdoor play，and claim it could help improve fitness，mental alertness and general happiness.

　　A documentary film，Project Wild Thing，will be a sign of the launch at more than 50 cinemas across the UK from Friday.It looks at the increasingly weak link between children and nature.

　　Members of the network include the National Trust，RSPB，Play England and the NHS sustainable development unit.Andy Simpson，chairman of the Wild Network，said，“The tragic truth is that kids have lost touch with nature and the outdoors in just one generation.Time spent outdoors is down，roaming ranges have fallen drastically，activity levels are declining and the ability to identify common species has been lost.”

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