[2]．..

　　[3]．..

　　[4]So Almutairi and her colleagues reported creating a new material for capsules that's even better.This one consists of a

　　long chain of compounds called cresol groups linked in a polymer.Cresol contains reactive(易反应的)components that make it highly unstable in its polymeric form，a feature Almutairi and her colleagues use to their advantage.After polymerizing the cresols，they cap each reactive component with a light­absorbing compound called Bhc.When the Bhcs absorb NIR light，the reactive groups are exposed and break the long polymer into two short chains.Shining additional light continues this breakdown，potentially releasing any drugs in the capsule.What's more，Almutairi says，Bhc is 10 times better at absorbing NIR than is ONB and is not poisonous to cells.

　　65．Which word can be used to complete the following process of changes?

　　―→―→

　　―→

　　A．protected　

　　B．formed

　　C．exposed

　　D．combined

　　【解析】　C。排列顺序题中的细节理解。本题与一般的排序题不同，顺序已经排好，在第二步空出一个动词，要求从所给的四个动词中选出可以用来完成所给的变化过程的动词。根据问题可以在第四段找到对应的内容。根据第四段中的“When the Bhcs absorb NIR light，the reactive groups are exposed and break the long polymer into two short chains.Shining additional light continues this breakdown，potentially releasing any drugs in the capsule.”可以看出对应的动词顺序为：absorb，expose，break，release。故选C。

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