关于毒物与职业中毒的概念，以下错误的是
A．毒物是指在一定条件下，投予较小剂量即可造成生物体功能性或器质性损害的化学物质
B．毒物在生产环境中的存在形态以固态、液体、气体或气溶胶的形态出现，对人体的危害以空气污染具有特别重要的意义
C．生产性毒物主要经消化道和皮肤进入人体，经消化道进人人体实际意义较大
D．接触生产性毒物时机体不一定受到损害，导致中毒是有条件的
E．毒物在生产过程中的存在形式主要有原料、中间产品、辅助材料、成品、副产品或废弃物、夹杂物等
参考答案：C
解析：生产性毒物主要经呼吸道吸收进入人体；也可经消化道和皮肤进入。
根据短文内容，从下面A-F选项中选出能概括每一段主题的最佳选项，并在答题卡上将该选项涂黑。选项中有一项为多余选项。
Americans are far more knowledgeable about drinks than they were 20 years ago. Witness the Starbucks revolution and you’ll know where the trend goes. Now, encouraged by recent studies suggesting that it can cut the risk of cancer and heart disease and slow the aging process, tea is enjoying a similar change. Enough fashionable tea houses are springing up to make even longtime coffee drinkers consider switching drinks. 小题2:________________ Tea is available in more places than ever. The Tea Association of the United States reports that from 1990 to 1999, annual sales of the drink grew to $4.6 billion from $1.8 billion. “Green tea is seen by consumers as a ‘functional food’” — delivering health benefits beyond food itself, says Vierhile. 小题3:_______________ Recently published studies point out that only teas that come from the leaves of the plant Camellia sinensis have been shown to contain health benefits. Other herbal teas may taste good, yet they do little more than warm up the drinker. But for Camellia sinensis, the evidence is powerful. In a 1998 study, Harvard University researchers found that drinking one cup of black tea a day lowered the risk of heart attack by as much as 44 percent compared with non-tea drinkers, and other studies have suggested that the antioxidants (抗氧化剂) in these so-called real teas can also prevent cancer. 小题4:________________ One such antioxidant in green tea is ECGC, a compound 20 times as powerful as vitamin E and 200 times as powerful as vitamin C. “When people ask me for something good and cheap they can do to reduce their cancer risk, I tell them to drink real tea,” says Mitchell Gaynor, director of medical oncology at New York City’s Strang-Cornell Cancer Prevention Center. 小题5:________________ Among those inspired to become a green-tea drinker is Tess Ghilaga, a New York writer who took it up after seeking advice from a nutritionist six years ago. “I’ve never been a coffee drinker,” says Ghilaga, 33. “She told me to start drinking green tea for the antioxidant qualities.” Now Ghilaga and her husband habitually make tea — they order theirs from InPursuitofTea.com, an Internet tea company. And although tea contains about half the amount of caffeine in a cup of coffee, “you still get such a kick from it,” says Ghilaga. |