Have you ever taken part in a .阅读理解

Have you ever taken part in a .阅读理解
Have you ever taken part in a marathon?A marathon is 42 km long.It is the longest race in the world.To make the runner’s body work,harder training is quite necessary.A runner should start to prepare for a marathon at least three months before.Preparation may have races,many hours of running at different speeds and changes in diet.During the training time the runner must eat a fit diet.The diet should have lots of things needed in training the players.
In the early days of training,runners run 80km per week.The running is increased every two or three weeks and at least two long runs per week are needed.Two weeks before the marathon,the training programme becomes less,from 100km per week down to 60km and then to 30km in the final week.On the last two days they may not run at all.
Breakfast should be eaten at least three hours before the race.Easily digested (消化) food such as cereal (谷类食物),toast(烤面包) and scrambled (碎的) eggs is best,with as much fluid (液体) as possible.Runners should drink water about half an hour before the race.
( )46.What is the length of a marathon?
A.100km.B.60km.C.42km.D.30km.
( )47.According to the passage,when should a marathon runner begin his training?
A.Three or four months before the race.B.A week before the race.
C.A month before the race.D.A year before the race.
( ) 48.What should a runner have for his breakfast on the day of the race?
A.Alight meal.B.A big meal
C.Lots of meat.D.Easily digested food.
( ) 49.Players must have __________ in order to run better in a marathon.
A.training at different speeds and changes in diet.B.much water
C.lessons before the race D.many fruits
( ) 50.Hard training before a marathon can ____________.
A.make the game more interesting
B.help the players to make more progress.
C.keep the players healthy D.have more fans
要准确答案,谢咯