A、Fall is the tourist season. B、You can park your car for free in fall. C、Fall has the best weather condition and less people. D

San Francisco is a very cool place. It’s the home of hippies and "flower power", and it’s full of friendly, relaxed people. It’s also one of the USA’s most attractive cities.
    Facing the Pacific Ocean to the west and San Francisco Bay to the north and east, it’s famous for its hills with their fantastic views of the Bay and its beautiful bridges. It’s a perfect base for a holiday, close to the Napa Valley, home of the Californian wine industry, and a few hours’ drive from the mountains of the Sierra Nevada.
    The best way to explore San Francisco is on foot. Walk slowly through North Beach, with its relaxed European charm, then into busy Chinatown. Go up expensive Nob Hill, and then continue into South Market and the Mission District, with their many nightclubs.(30)San Francisco is famous for its liberal lifestyle, and it has some of the most incredible nightlife and wonderful food anywhere in the States.
    San Francisco is a popular place to visit at any time of the year. Summer is the tourist season, so prices are higher, queues are longer, and finding a parking place is impossible.(31)The best months for weather are between mid-September and mid-November, but you’ll have a great time whenever you go.
29. Q: What is the geographic location of San Francisco?
30. Q: According to the passage, what do we know about the city?
31. Q: Why does the speaker recommend fall to be the best time for travelling?