RAZ分级阅读 · RAZ I级
Fast and Faster
How Fast? How fast can you run? How fast can you swim? Humans are slow compared to some animals. Which animals are the fastest?
Running The fastest runner is the cheetah. It can go as fast as a car on a highway! Cheetahs can only run that speed for a short time, though. They sprint to catch prey.
Cheetahs eat gazelles, which are not quite as fast as cheetahs. Gazelles can run fast for a longer time, though.
Small animals are slower than big animals, but some go fast for their size. The tiger beetle runs 170 times the length of its body in one second. If humans could do that, they could race jet planes!
Swimming Turtles are slow on land, yet the world's fastest reptile is a turtle! It can swim four times as fast as a human.
