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  3. 共用题干 Seeing Red Means Danger AheadThe c

共用题干 Seeing Red Means Danger AheadThe c

恬恬2019-12-17  28
问题 共用题干Seeing Red Means Danger Ahead

The color red often means danger一and by paying attention,accidents can be prevented.In the future,
the color red also may help_________（51)danger at construction sites.Thanks to new work by engineers,
bridge supports一or________(52)kinds of materials一could one day contain a color-changing material.It
will turn red_________(53)a structure collapses or falls apart.
The secret__________(54)the color-switching material is。particular typo of molecule（分子）.A mole-
cule 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 molecule behaves depends on
_________(57) kinds of atoms it contains,and how they're held together.
When a polymer(聚合物）containing a color-changing molecule called a mechanophore (机械响应性聚
合物）which is about to break,it produces a_________(58).When a polymer with mechanophore molecules
becomes" injured" or__________(59),one of the mechanophore bonds________（60）and the material turns
red."It'S a really simple detection method,"says Nancy Sottos,one of the scientists who worked on the pro-
ject.Sottos and her team tested the color-changing polymers in their lab.The test_________(61)proved
encouraging,
There is a way to get rid of the red color:light. When a bright light is shone on the mechanophore,the
broken bond is fixed,and the red color________(62).This"self-healing"may be a problem for mngi-
neers.They need to use the color-changer in big construction projects that will be_________(63)in sun-
light. And sunlight will make the rnechanophore'S warning system______(64).
Sottos and her fellow scientists still have _________(65)work to do before the color-changing mole-
cules can be used outside the lab.
选项 _________(51)A:throwB:preventC:createD:keep
答案B
解析从空格前的“also may help”和上文的“prevent”一词可知答案。 bridge supports意为“桥梁支柱”，后用or连接，是指与桥梁支柱同样的事物，所以插入语部分应该指“其他建筑材料”。another指“再，另”;the other指其他所有的；others是代词，后 面不能跟名词。other泛指其他的，后可跟名词。 按照逻辑推理，应该是倒塌前变红色，这样才起作用，所以选before。 secret behind…表示“……背后的秘密”;under也有底下的意思，但更强调地理空间；用 于抽象事物时，多用behind。 介词in可以表示形式、形状或数量。 这里指，分子构成了各种我们肉眼所看到的事物。根据上下文可知，应选择everything。 depends on后面是一个宾语从句，在这个从句中，atoms是contains的宾语，what kinds of 可用来修饰atoms。 根据上下文可知应选color。 应选择和injured相近的词语，所以选weak。 这里指分子受损或变弱时键会断开，所以选break。 这里指实验结果令人振奋，所以应选results。 前文说断开的键复合，相对应的，红色应是消失、褪去。 从空后的“in sunlight”可知应选outside。 上文提到，光会使红色褪去，所以阳光会使这一警报失效。 这里指还需要做很多工作，所以选a lot of 。
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