As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.

【小题1】What advantage does race walking have over running?

A．It’s more popular at the Olympics.

B．It’s less challenging physically.

C．It’s more effective in body building.

D．It’s less likely to cause knee injuries.

【小题2】What is Dr. Norberg’s suggestion for someone trying race walking?

A．Getting experts’ opinions.	B．Having a medical checkup.
C．Hiring an experienced coach.	D．Doing regular exercises.