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。阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。There are many ways to find a job. It can be as easy as walking into a neighborhood store to look at its announcement board . Local stores often have areas where people can put small signs telling what kind of service they need or can provide. Such services include caring for children or cleaning houses.

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