试述辅助馈线（馈电线）和架空地线的作用？

School is over and it’s time for the family to get your children moving and have fun. Choose a suitable one from the following family activities.

Gymnastics Gymnastics helps to improve flexibility, strength, and teaches self-discipline. Although Olympic-level gymnastics take years of practice to master, more simple moves are easy to learn in a day and can be practiced at home. Suitable for: 4+ Cost: £6 an hour Contact: British Gymnastics; 084 512 97129; www.british-gymnastics.org

Surfing What is required to learn the art of surfing is to combine balance, coordination and patience, which means that it’s not easy to learning that, but the excitement of jumping to your feet on the board for the first time and riding a wave into the shore is an excellent experience. Suitable for: 8+ Cost: £30 an hour Contact: www.nationalsurfingcentre.com, 016 378 50737

Sailing Sailing is beneficial for developing confidence and provides a pure mental and physical challenge from the beginning. It can be done alone, and picking up the basics is not difficult. Suitable for: 8+ Cost: Free Contact: Royal Yachting Association; 084 534 50400; www.rya.org.uk

Diving This is a great way to make swimming even more fun. High board diving needs muscle control. Lessons begin at the poolside, where you will learn some basic skills before moving on to the boards, Try a saltwater pool, on warmer days, and enjoy the fresh air, high boards and water games. Suitable for: 13+ Cost: The first lesson, which lasts one hour, is usually free if you decide to carry on. £10/£20 an hour. Contact: Find your local swimming pool at www. britishswimming.org; 015 096 18700

小题1:If you have a child of seven, you would like to choose ______ for him/her.

A．Diving

B．Sailing

C．Surfing

D．Gymnastics

小题2:Taking a 10-hour course in diving needs at least       .

A．£200

B．£100

C．£90

D．£30

小题3:In order to build up your children’s confidence, you can call        .

A．015 096 18700

B．084 534 50400

C．016 378 50737

D．084 512 97129

小题4:According to the passage, we know that       .

A．it is very difficult to learn basic sailing skills.

B．it is impossible to practice gymnastics at home

C．self-discipline is needed to do high board diving

D．surfing needs qualities of patience and balance