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  3. In a lab in Oxford University’s experimental psychology department, researcher Roi Cohen Kadosh is testing a relatively new brai

In a lab in Oxford University’s experimental psychology department, researcher Roi Cohen Kadosh is testing a relatively new brai

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问题     In a lab in Oxford University’s experimental psychology department, researcher Roi Cohen Kadosh is testing a relatively new brain-stimulation technique which may help people learn and improve their understanding of math concepts.
    The electrodes (a small piece of metal or other substance that is used to take an electric current) are【C1】______in a tightly fitted cap and worn around the head. The device, run off a 9-volt battery commonly used in smoke detectors, induces only a【C2】______current and can be targeted to【C3】______areas of the brain or applied generally. The mild current reduces the【C4】______of side effects, which has【C5】______possibilities about using it, even in individuals【C6】______a disorder, as a general cognitive【C7】______. Scientists also are investigating its use to treat mood disorders and【C8】______conditions.
    Dr. Cohen Kadosh’s【C9】______work on learning enhancement and brain stimulation is one example of the long journey faced by scientists【C10】______ brain-stimulation and cognitive-stimulation techniques. 【C11】______other researchers in the community, he has dealt with public【C12】______about safety and side effects, plus【C13】______from other scientists about whether these findings would hold in the wider population.
    There are also ethical questions about the technique. 【C14】______it truly works to enhance cognitive performance, should it be【C15】______to anyone who can afford to buy the device—which already is【C16】______for sale in the U.S.? Should parents be able to perform such stimulation on their kids without【C17】______? "It’s early days but that hasn’t stopped some companies from【C18】______ the device and marketing it as a learning tool," Dr. Cohen Kadosh says. "Be very【C19】______ ."
    However, if the technique continues to show【C20】______, "this type of method may have a chance to be the new drug of the 21st century," says Dr. Cohen Kadosh.
【C9】
选项 A、demanding
B、pioneering
C、alarming
D、confusing
答案B
解析 此处需要一个形容词对科恩博士的工作性质作一个大概的总结。第1段提到，我们发现这是一个新技术，可能可以促进对数学概念的理解。第2段中也提到这项技术在很多方面取得了突破。综合这些信息，科恩博士的工作应该是pioneering“首创的，先驱的”。
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