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导语：以下英语网为大家整理了全面的职称英语考试历年真题及答案解析，《职称英语考试试题汇总：历年真题及答案解析》供大家参考学习。更多职称英语考试试题敬请关注英语网！ 【推荐】关注英语网微信：yingyuwang2013，更快获取真题答案及成绩查询信息。 第6部分：完形填空(第51～65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Seeing Red Means Danger Ahead The color red often means danger and by paying attention，accidents can be prevented． In thefuture，the color red also may help__________(51)danger at construction sites．Thanks to new workby engineers，bridge supports or_________(52)kinds of materials could one dav contain a colorswitching material．It will turn red__________(53)a structure collapses or falls apart． The secret_________(54)the color switching material is a particular type of molecule(分子)． A molecule is a group of atoms(原子)held together by chemical bonds．Molecules come (55)all shapes and sizes，and make up___________(56)．You can see，touch or feel．How a mole． cule behaves depends on___________(57)kinds of atoms it contains，and how thevre held together． When a polymer(聚合物)containing a color switching molecule called a mechanophore(机械响应性聚合物)which is about to break，it produce a__________(58)．When a polymer withmechanophore molecules becomesinjuredor_______________(59)，one of the mechanophore bonds__________(60)and the material turns red．Its a really simple detection method．says NancySottos，one of the scientists who worked on the project． Sottos and her team tested the color switc． hing polymers in their lab．The test__________(61)proved encouraging． | 
