Read the following paragraph and

Read the following paragraph and underline the topic sentences.
Surrounded by water on three sides and ringed to the northeast by the snow-crowned Coast Mountains, Vancouver has a floating quality of natural loveliness. At English Bay, the half-moon curve of beach is backed by high rises in pale tones of beige, blue, and ice-cream pink. Turn-of-the-century houses frown upward at the glitter of office towers. Yet any urban glare is quickly softened by folds of green lawns, flowers, fountains, and trees that in a seemingly unplanned fashion link Vancouver to near ultimate treasure of greenness——thousand-acre Stanley Park. And always it is the surrounding stretches of water that dominate, with their image-evoking names like False Creek and Lost Lagoon and pleasure craft skim blithely across Burrard Inlet, while out in English Bay foreign freighters await their turn to take on cargoes of grain.
【正确答案】：Surrounded by water on three sides and ringed to the northeast by the snow-crowned Coast Mountains, Vancouver has a floating quality of natural loveliness.
【题目解析】：p126