英语听力：自然百科 虫虫兄弟—12（在线收听）

 One down and a billion, the estimated population of cockroaches on the planet to go. The capture in one bug barely makes a difference, especially when the dust mites have landed. There are up to 100,000 of them living in one square meter of carpet. The vacuum just makes things worse. It stirs up the dust, sending the bugs flying, and any mites that had sucked up are soon replaced. Because dust mites don't suit to eat skin and defecate, they also have lots of sex. Females lay up to 300 eggs in their lifetime. The * went the war on the shag pile. They've lost one battle on the bedding. Mrs Smith is a mass murderer. At least 50,000 dust mites exterminated in a 60 degree hot wash.