D. It is not effective enough and could be poisonous.
3. Which word can be used to complete the following process of changes?
⇨⇨⇨
A. protected
B. formed
C. exposed
D. combined
【要点综述】这是一篇科技文。怎样使用胶囊?如何让吃药更加安全、疗效更好?文章对此做了介绍。
. B 信息理解题。根据第一段最后一句“Now, researchers in California have designed what could be a harmless trigger to date: shining nearinfrared light (NIR,近红外线) on the drug in the capsule.”可知答案。
. D 推理判断题。根据第三段最后两句“…ONB groups fall off the polymer, leading to its breakdown.”和“…and it could be poisonous to cells…”可知答案。
. C 信息理解题。根据最后一段第五句“When the Bhcs absorb NIR light, the reactive groups are exposed and break the long polymer into two short chains.”可知此处用exposed,即C项正确。
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