: Completing a marathon is considered very difficult, many coaches believe that it is possible for anyone who is willing to put in the time and effort. Obviously, most participants do not run a marathon to win. More important for most runners is their personal finish time and their placement within their specific age group and gender. Another very important goal is to break certain time barriers. For example, ambitious recreational first-timers often try to run the marathon under 4 hours; more competitive runners will attempt to run under 3 hours. Many runners then prefer to finish for example in 3:29:59, which makes them "sub-3:30h marathoners", instead of 3:30:01. For most runners, the marathon is the longest run they have ever attempted. Many coaches believe that the most important element in marathon training is the long run. Recreational runners commonly try to reach a maximum of about 20 miles in their longest weekly run and about 40 miles a week in total when training for the marathon. More experienced marathoners may run a longer distance. During marathon training, adequate recovery time is crucial. If fatigue or pain is felt, it is recommended to take a break for a couple of days or more to let the body heal. Overtraining is a condition that results from not getting enough rest to allow the body to recover from difficult training. It can actually result in a lower endurance and speed and place a runner at a greater risk of injury.

1: The word attempted in the passage means ____________.

A. tried B. lost C. failed D. given up

2: One of the important goals in a marathon competition is __________.

A. breaking time barriers B. age C. gender D. reaching the finish

3: In marathon training, the most important is ____________.

A. the age B. the coaches' belief C. the long run D. the recreation

4: If the marathon runner feels tired or has a pain, _________.

A. he should continue the training B. he should quit running forever C. it is time for him to stop his training D. he should take a break for several days

5: Overtraining may lead to _________.

A. good results B. long endurance C. injury D. recovery                                                                                                       5. A bring B. brought C. bringing D. to bring