Key words Extinct: Pesticide:a chemical used to kill pests (as rodents or insects) Sewage:['sju(:)id3]waste matter carried away in sewers or drains脏水，污水 Tropical rain forest: ·Mammal:: 8999999992288888●●●●●000●09。●●0●。 Key words • Extinct: • Pesticide: a chemical used to kill pests (as rodents or insects) • Sewage: ['sju(:)idʒ] waste matter carried away in sewers or drains 脏水,污水 • Tropical rain forest: • Mammal: