(4)Let’s Go “Number Two”
       People don’t like poop because it usually smells bad,but some poop is useful. For example, we can make paperwith elephant poop and the most expensive coffee in theworld comes from an animal’s poop. Then, what can wedo with human poop?
       A special kind of bus runs in England. People call it the“Bio-Bus,” or the “Number Two Bus.” “Number Two”can mean poop in English. The bus gets power from trashand human waste. It can run about three hundredkilometers. In other words, the bus can travel from Taipeito Tainan with a tank of the gas from human waste. Isn’t it amazing?
       Bio-Buses are good for the Earth. Believe it or not,these buses are not stinky at all. Let’s all go “NumberTwo” to help the world.

 ✎ poop 大便 ✎ tank 缸 ✎ Bio-Bus 生物燃料巴士
【題組】29. The word “waste” here means ________.
(A) food
(B) poop
(C) drinks
(D) clothes