30.What are you encouraged to do when travelling in New Zealand?

　　A. Take your own camping facilities.

　　B. Bury glass far away from rivers.

　　C. Follow the track for the sake of plants.

　　D. Observe signs to approach nesting birds.

　　D

　　If humans were truly at home under the light of the moon and stars, we would go in darkness happily, the midnight world as visible to us as it is to the vast number of nocturnal(夜间活动的) species on this planet. Instead, we are diurnal creatures, with eyes adapted to living in the sun’s light. This is a basic evolutionary fact, even though most of us don’t think of ourselves as diurnal beings. Yet it’s the only way to explain what we’ve done to the night: We’ve engineered it to receive us by filling it with light.

　　The benefits of this kind of engineering come with consequences 一 called light pollution 一 whose effects scientists are only now beginning to study. Light pollution is largely the result of bad

　　lighting design，which allows artificial light to shine outward and upward into the sky. III-designed lighting washes out the darkness of night and completely changes the light levels 一 and light

　　rhythms — to which many forms of life, including ourselves, have adapted. Wherever human light spills into the natural world, some aspect or life is affected.

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