共用题干Seeing Red Means Danger AheadThe 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 shapesand 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._________(51)A:throwB:preventC:createD:keep
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.
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.
_________(51)
A:throw
B:prevent
C:create
D:keep
A:throw
B:prevent
C:create
D:keep
参考解析
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 。
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 。