阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
San Francisco better local garden
The San Francisco Botanical Garden is one of the most diverse gardens in the world. The garden is a living museum within Golden Gate Park, offering 55 acres（英亩）of both beautiful gardens and open spaces.
The garden is open during COVID-19. It is free to all San Francisco residents and garden members. We are also continuing to offer free admission every morning to everyone from 7：30 am to 9 am—a fantastic time for bird-watching. The second Tuesday of the month is also free to everyone.
Free Day:
Second Tuesday of every month;Free daily from 7：30 am to 9 am;Always free for San Francisco city and county residents；Always free for garden members and school groups.
Regular Cost:
Adults $9;Foreign adults $12;Youth and seniors $7;Children $3;Children 4 years old and younger free.
Last Entry:
Fall and winter:October through early November（Last entry at 5 pm）;First Sunday in November through January（Last entry at 4pm）;February through second Saturday in March（Last entry at 5 pm）.
Spring and summer:Second Sunday in March through September（Last entry at 6 pm）.
（The garden closes one hour after last entry. ）
21. What do we know about the San Francisco Botanical Garden?
A. It is closed during COVID-19. B. It is free for local people.
C. It is free for everyone on Tuesday. D. It is located near Golden Gate Park.
22. How much does it cost a foreign adult to visit the garden on weekdays?
A. $3. B. $7. C. $9. D. $12.
23. At which of the following time can visitors enter the garden?
A. At 4pm in June. B. At 5 pm in December.
C. At 7pm in March. D. At 6 pm in February.
