阅读理解。 ●Tower Bridge is one of London's most well known landmarks. Opened in 1894, this hydraulic (液压的) bridge can be raised to permit river traffic to pass underneath. Visitors to Tower Bridge can enjoy wonderful views of the River Thames from the bridge towers. There is also a museum which explains how the bascule bridge operates and discusses its history. Tower Bridge is often incorrectly referred to as London Bridge. London Bridge, however, is a different bridge that is located directly upstream from Tower Bridge. ●The British Museum is a 'must do' for all visitors to London, England. Treasures from around the world can be found in Britain's largest and most popular museum. To top it off, admission to the British Museum is free of charge. Due to the enormous size of the museums, visitors should be clear about what they wish to see. One 'must see' is the Rosetta Stone-a key puzzle piece in the recorded history of humankind. The British Museum is located in the Bloomsbury district of London in London WC1. ●Greenwich Park is a beautiful large park located a few kilometers away from the centre of London. Attractions in Greenwich include the Cutty Sark, the Gypsy Moth and the Old Royal Observatory. A painted line at the observatory indicates zero degrees of longitude (经度). Many visitors to Greenwich enjoy having their photos taken with one leg in the western hemisphere (半球) and the other in the eastern hemisphere. Greenwich is the place where time was officially tracked - 'Greenwich Mean Time' or 'GMT'. Greenwich is located in London SE10. ●The Eurostar high-speed train service provides fast connections between London and Paris and London and Brussels. The Eurostar trains pass through the 32-mile Channel Tunnel under the English Channel. The tunnel is also known as the 'Euro Tunnel'or 'Chunnel'. The Channel Tunnel is considered to be one of the world's great engineering wonders. Trains leave form the Waterloo Rail Station which is located in south London.