◎Cambridge Discovery Education Interactive Readers are the next generation of graded readers - captivating topics, high-impact video, and interactive exercises designed to motivate and engage.
How fast is fast? Humans, cars, animals: they all have the ability to go fast. Come explore the many ways we can speed.
加速，為了獵食、為了移動、為了競賽、為了……好玩！快速，往往代表著刺激和樂趣。
多「快」能稱得上「快」? 42公里的馬拉松，叉角羚羊不到一小時即可完賽；旗魚衝刺起來，時速110公里輕鬆達標；時時想著打破世界紀錄的人類呢？備好240萬美金，時速430公里法國超跑的引擎，替你製造音爆！還能多快？快快看過來！