英语听力：自然百科 虫虫兄弟—16（在线收听）

 Ticks can spread a huge variety of diseases, and pass them all along at the same time through just one bite. Claw in the air as they search for a host, there is no hurry. Ticks can't fly and they crawl so slowly that their greatest skill is patience. They can last several years between blood meals. Not surprisingly, when they get it, they more than seize the moment. A tick is built to bite, with a head * harpoon like bulbs, and a mouth that creates cement-like glue to clamp them in place as they feed. It's such a successful design that their heads stay put even when savored from the body. After mosquitoes, ticks are one of the biggest effectors of disease, lime disease and encephalitis are just two possibilities. Not the need to go outside to pick up a virus when so many creatures do home deliveries. Like Danielle's indestructable friend. Across the world, cockroaches spread TB and cholera. Luckily this one's just looking for a square meal, like a computer keyboard clogged with dead skin. But there are even more gruesome things are tonight's menu. Despite scrubbing the kichen, Maria has some unhygienic helpers for tonight's meal. Flies don't care how rare they need served...