12015江苏A 56. According to the Code, visitors should act _______ .A. with care and respectB. with relief and pleasureC. with caution and calmnessD. with attention and observation57. 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.BIn the United States alone, over 100 million cell-phones are thrown away each year. Cell-phones are part of a growing mountain of electronic waste like computers and personal digital assistants. The electronic waste stream is increasing three times faster than traditional garbage as a whole.Electronic devices contain valuable metals such as gold and silver. A Swiss study reported that while the weight of electronic goods represented by precious metals was relatively small in comparison to total waste, the
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