听第10段材料，回答第17至20题。

17. What kind of people especially needs exercise?

A. Adults from 20 to 80.

B. Young people in their teens.

C. Those who sit most of the day.

18. What exercise is the most suitable for beginners?

　A. Jogging. B. Weightlifting. C. Climbing.

19. How long would it be better for an exercise period to last?

A. 5 to 10 minutes.

B. 15 to 20 minutes.

C. 25 to 30 minutes.

20. What is the best time for exercise?

　A. Morning. B. Afternoon. C. Evening.

第二部分　阅读理解(共两节，满分40分)

第一节(共15小题；每小题2分，满分30分)

阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　Philadelphia offers a ton of attractions that are suitable for people of every age and here are some family-friendly attractions．

　　Spruce Street Harbor Park

　　Spruce Street Harbor Park, one of the best urban beaches in America, is an outdoor heaven on the Delaware River waterfront. Visitors can relax in a hammock, play on the playgrounds, and play games like table tennis and giant chess. Don't miss out on the park at night, when colorful LED lights hanging from treetops make the entire area bright.

　　Blue Cross RiverRink

　　Offering ice skating in the winter and roller skating in the summer, Blue Cross RiverRink creates a fun, outdoor experience for the whole family. Visitors can play on the nine-hole mini-golf course during the summer, and enjoy eats and drinks from the on-site (现场的) bar and restaurant all year round．

　　Sesame Place

　　Big Bird, Elmo and the other stars of Sesame Street come out and play at Sesame Place, the only theme park in the nation starring the popular TV show's most lovable characters. A water park, interactive activities, parades, fireworks and shows add to the fun．

Once Upon a Nation Storytelling Benches