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  3. Although Consumers Union concedes that "no confirmed cases of harm to humans from manufactured nanoparticles have been reported"

Although Consumers Union concedes that "no confirmed cases of harm to humans from manufactured nanoparticles have been reported"

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问题    Although Consumers Union concedes that "no confirmed cases of harm to humans from manufactured nanoparticles have been reported", it adds that "there is cause for concern based on several worrisome findings from the limited laboratory and animal research so far." It worries that particles that are nontoxic at normal sizes may become toxic when nanosized; that these nanoparticles, which are already present in cosmetics and food, can more easily "enter the body and its Vital organs, including the brain", than normal particles; and that nanomaterials will linger longer in the environment. All of this really comes down to pointing out that some particles are smaller than others. Size is not a reliable indicator of potential harm to human beings, and nature itself is filled with nanoparticles. But the default assumption of danger from the new is palpable.
   Anti-nanotech sentiment has not been restricted to Consumers Union’s relatively short list of concerns. In France, groups of hundreds of protesters have rallied against even such benign manifestations of the technology as the carbon nanotubules that allow Parkinson’ s sufferers to stop tremors by directing medicine to their own brains. In England members of a group called THRONG (The Heavenly Righteous Opposed to Nanotech Greed) have disrupted nanotech business conferences dressed as angels. In 2005 naked protesters appeared in front of an Eddie Bauer store in Chicago to condemn one of the more visible uses of nanotech: stain-resistant pants.
   These nanopants employ billions of tiny whiskers to create a layer of air above the rest of the fabric, causing liquids to roll off easily. It’s not quite what Kurzweil and Crichton had in mind, nor is it "little robots in your pants", as CNN put it. But nanotechnology arguably embraces any item that incorporates engineering at the molecular level, including mundane products like this one.
   Just as the nano label can be broadly applied to products for branding and attention-grabbing purposes, so too can critics use the label to condemn barely related developments by linking them to the (still hypothetical) problems of nanopollution and gray goo. But there’s a danger in thinking of nanotech only in god-or-goo terms. People at both extremes of the controversy fail to appreciate the humble, incremental, yet encouraging progress that nanotech researchers are making. And focusing on dramatic visions of nanotech heaven or hell may foster restrictions that delay or block innovations that can extend and improve our lives.
What worries Consumers Union is that nanoparticles______.
选项 A、become essential components of cosmetics and food
B、linger in environment and are omnipresent in nature
C、present in products may cause harm to human beings
D、can enter the brain more easily than normal particles
答案C
解析 此题为细节分析题。第一段前两句：虽然消费者协会承认“至今没有关于制造的纳米粒子产生对人体有害的确诊病例”；但却补充说，根据目前有限的实验室和动物研究获得的几项令人不安的发现表明，这种担心是不无道理的。接下来后文具体指出令人担忧的具体问题，如粒子在纳米化后可能有毒。也就是说，令消费者协会忧虑的是目前的产品可能会危害人类，C选项为正确答案。
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