21£®If you like to enjoy the most sunshine of the year, you'll probably book the ticket to ________.

A£®San Francisco 

B£®New York

C£®Chinatown 

D£®Los Angeles

22£®What is special about San Francisco is that you can ________.

A£®enjoy wonderful nights

B£®visit famous squares

C£®see famous plays

D£®ride a horse£­drawn carriage

23£®What is the main purpose of the passage?

A£®To introduce three famous cities.

B£®To attract tourists to book flights.

C£®To introduce some scenic spots.

D£®To recommend tourist activities.