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What is the hardest sport in the world? Some people say it’s boxing (拳击), because boxing is dangerous and boxers have to be strong and fast. Other people say the hardest sport is soccer.

However, most people say the hardest sport is the triathlon (三项全能运动). A triathlon is a race that includes three sports. First, racers swim. After that they ride bicycles and finally they run. In the most common triathlon, racers swim 1.5 kilometers, bike 40 kilometers, and run 10 kilometers. The winner is the person who finishes the race first.

There is another kind of triathlon, too. It is called the “Ironman Triathlon (铁人三项)”. This triathlon is much longer. People who finish this triathlon are called “ironmen” and “ironwomen”. This is because these people are so strong that their bodies are just like iron (铁).

In the past few years, there have been other races including three sports. However, they didn’t use the word “triathlon”. That word was first used to describe a race in California in 1974.

Triathlon racers have to train very hard for their races. Many of them swim and run. A lot of people also do things like yoga (瑜伽). They have many different ways to prepare, but they all have the same goal. They want to be in perfect shape.

To be an ironman or an ironwoman, you have to be strong and smart. You should know how to save energy during the race.

1．According to the passage, most people say that the hardest sport is ________.

A．boxing

B．soccer

C．basketball

D．triathlon

2．The triathlon includes three sports, racers have to ________.

A．box, swim and run	B．swim, ride bicycles and run
C．swim, jump and box	D．ride bicycles, swim and box

3．The sports players in the most common triathlon have to ride bicycles ________.

A．1.5 kilometers	B．40 kilometers
C．10 kilometers	D．51.5 kilometers

4．We call people who finish this triathlon “ironmen” and “ironwomen” because ________.

A．they like riding iron bikes	B．they like making iron
C．they are as strong as iron	D．they can get a piece of iron

5．The passage is mainly about ________.

A．what the triathlon is	B．why the triathlon is popular
C．when the triathlon started	D．how the triathlon racers train