◆ Corona Heights Dog Park

　　Often visited by residents from all over the city because of its nearness to the Randall Museum, Corona Heights Dog Park offers pets and owners breathtaking views, after a steep hillside climb, and a fenced dog area that allows dogs to let loose without a leash （狗链）. Owners will also enjoy the playground, tennis courts and basketball courts.

◆ Dolores Dog Park

　　The grounds of Dolores Park once served as camps for those who were left homeless by the 1906 earthquake, but now often visited by crowds of Mission District people. Four-legged friends can also wander about carefree off-leash while making friends with other members of the doggie community.

◆ Pine Lake Dog Park

　　Noteworthy for its place as a rest stop for hundreds of species of birds to fly to and from warmer climates, Pine Lake Park is also prized by city dogs and their owners for their nice hiking paths, picturesque lake suited for swimming, and an off-leash area on the park's west end that lets dogs run free.

◆ Buena Vista Dog Park

　　At 146 years young, Buena Vista Park is San Francisco's oldest park. Dogs and owners with plus energy will love burning it on this park's steep paths and winding staircases. Dog owners should have good control over their dogs, as it's quite easy for dogs to get separated when going through Buena Vista's many twists and turns.

21. Why do dog owners take their pets to Dolores Dog Park?

A. To let them socialize. B. To give them rescue lessons.

C. To help them lose weight. D. To increase their physical activities.

22. Which dog park is popular with bird lovers?

A. Corona Heights Dog Park. B. Dolores Dog Park.

C. Pine Lake Dog Park. D. Buena Vista Dog Park.

23. What is special about Buena Vista Dog Park?

A. It is suitable for swimming. B. It is close to a museum.

C. Dogs must be on a leash. D. Dogs can go climbing.

　　B

　　To personal trainer Sammy Callari, 13-year-old Parker Seward is more than a client (客户). He's his "little brother". Over the past year, the pair have bonded. They play basketball together, share meals and dance to hip-hop like no one's watching.

The trainer was asked to work with the 13-year-old boy, who has Down syndrome (唐氏症), because his coworker who dealt with the boy was out of town last spring. Callari had never worked with someone with a disability before. He was anxious the first day he met Parker. But Parker's big smile and cheery introduction immediately put him at ease. He reminded Callari of himself when he