B．provide cheaper energy for developing countries

　　C．offer people in developing countries access to pure water

　　D．gain a deeper understanding of the photosynthesis process

　　35．The main idea of this passage is ________.

　　A．an introduction to the history of artificial leaves

　　B．an invention copying photosynthesis

　　C．giving energy to the poor

　　D．a mixture of water power and solar energy

　　【】Today, we are told, children don't spend enough time in the fresh air. Many of them are addicted to a screen either on a computer or a TV — they seem to be living in a virtual world. They have lost touch with nature.

　　But now 400 organizations in the UK, from playgroups to the National Health Service, are encouraging children to have some “wild time”. They want kids to swap at least 30 minutes of watching TV or playing computer games for time playing outside. Activities such as building dens, climbing trees and playing hide and seek are just some of the things kids can do. Even if they live in a city, they can go on adventures in the garden or the park.

　　Children often need a helping hand from mum and dad. They need to be shown what to do and where to go. Andy Simpson from National Health Service says, “We want parents to see what this magical wonder product does for their kids' development, independence and creativity, by giving wild time a go”．

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