【答案解析】蟑螂是世界上最常见的有害昆虫。全球5000个品种中，大约只有六种对人类造成困扰。不过，以它们繁殖的速度来看，六种就够了。 [解析]
Cockroaches are the most common insect pests in the world. Of the 5,000 species worldwide, only about six ever bother humans. But that"s enough, considering how fast they breed.

【答案解析】所有取得石油工程学位的学生在毕业之前已经找好了工作。本科毕业生起薪从70000美元到85000美元不等。 [解析]
By graduation day, every student completing a petroleum engineering degree had already found a job. Starting salaries for undergraduate degree-holders range from $ 70,000 to $ 85,000.

【答案解析】现代化的通讯手段非常迅速，一个买主虽然在几千英里之外，却能知道卖家的要价。因此，任何一样东西的市场就其潜在意义讲是世界性的。 [解析]
Modern means of communication are so rapid that a buyer can discover what price a seller is asking, although he may be thousands of miles away. Thus the market for anything is, potentially, the whole world.

【答案解析】生活里充满了危险和意外。你的房子可能会着火。你可能会从窗户上跌下去而摔断脖子。任何事情都可能发生，从来也说不准。 [解析]
Life is full of dangers and surprises. Your house may burn down. You may fall out of the window and break your neck. Anything may happen, you never know.

【答案解析】想象我们生活在一个不再使用现金的社会。代替现金的是电子“货币”，如同在银行卡系统中那样。纸币和硬币都被废弃。如果能实现，立即带来的好处是深刻而根本的。 [解析]
Imagine a society in which cash no longer exists. Instead, "cash" is electronic, as in bankcard systems. Currency and coin are abandoned. The immediate benefits would be profound and fundamental.