Setting up separate bicycle tracks is an effective way to _______ bicycle accidents and improve the safety for riders who share the road with motor vehicles.

The "new set of wheels" that bicycle riders had to get used to was （） A: the new tires on their bikes B: the automobile C: the streetcar D: the bicycle itself

In what way is the sport like waterskiing? A: They both started in California. B: The riders are both towed behind a speedboat. C: The riders are launched into the air.

When was the first bicycle invented The first bicycle was invented .

Waterskiing riders are towed behind a specially built speedboat.

Why does John want to buy a bicycle A: To replace his stolen bicycle. B: To begin bicycling to work. C: To join a bicycle club. D: To train for a bicycle rac

When might the skateboard riders have a big fall?When they are most__________________.

Which is _____ , a bicycle or a computer?

Riders of different levels think differently when lining up at the starting line.

D6.Which bicycle is Bobert's?________________________