Lots of students know what a marathon （马拉松赛跑） is， but perhaps they don't know what a triathlon is． The triathlon is a sport that has three parts ﹣ swimming， bicycling and running． It is not an easy sport， but a man named Joe Salter is very good at it． A few months ago， he finished a special triathlon ﹣ he juggled （抛起接住） three balls all the time during the triathlon． That is to say， he kept on throwing and catching three balls while he was swimming， riding a bicycle and running．

31﹣year﹣old Joe is from Florida， the USA． He loves juggling and he started at the age of 8． Joe did well in juggling． Later， he got the idea to do a triathlon and juggle at the same time to make it more fun． Many juggling fans laughed at his idea and thought it was just a joke． But Joe didn't give up and he kept practising it． Because of his hard work， he made it at last．

Talking about his triathlon， Joe said swimming was the hardest part． "lt was difficult and complex（复杂的），" he said． "I basically only used my legs， so it took quite a lot of work． Also， swimming in open water made it a little harder． It was not like in a pool．"

（1）According to the writer， the common triathlon　　．

A． is a difficult sport

B． is more famous than the marathon

C． includes the three parts and juggling

D． includes the marathon and swimming

（2）Joe's triathlon was special because　　 during the triathlon．

A． he picked up three balls

B． he played juggling

C． he carried his bicycle on his shoulder

D． he threw away all his balls

（3）Many juggling fans thought Joe's idea　　．

A． could not be realized

B． should not be laughed at

C． should be realized as soon as possible

D． could make triathlon more exciting

（4）The underlined part "made it" in the 2nd paragraph probably means　　．

A． forgot

B． failed

C． succeeded

D． left

（5）Swimming was the hardest part for Joe mainly because　　．

A． he swam in open water

B． his swimming skills were bad

C． he was very tired when swimming

D． he almost could only swim with his legs