题目内容：

If you’re new to San Francisco, paying the city a visit, or simply looking for a new playground for you and your dog, here are four of the finest dog parks in San Francisco.

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 view 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 are 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

Famous 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 off-leash area on the park’s west end that lets dogs run free.

Buena Vista Dog Park

With a history of 146 years, 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.

1.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.

2.Which dog park is popular with bird lovers?

A. Dolores Dog Park.    B. Pine Lake Dog Park.

C. Buena Vista Dog Park.    D. Corona Heights Dog Park.

3.What is special about Buena Vista Dog Park?

A. Dogs can go climbing.    B. It is close to a museum.

C. Dogs must be on a leash.    D. It is suitable for swimming.