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n. 罢工，打击，殴打
v. 打，撞，罢工，划
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第6部分：完形填空（第52~65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 the future, the color red also may help ________ (51) danger at construction sites. Thanks to new work by engineers, bridge supports — or ________ (52) kinds of materials — could one day contain a color-changing material. It will turn red ________ (53) a structure collapses or falls apart.
The secret ________ (54) the color-changing 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 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）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 project. 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 engineers. They need to use the color-changer in big construction projects that will be ________ (63), in sunlight. And sunlight will make the mechanophore’s warning system ________ (64).
Sottos and her fellow scientists still have ________ (65) work to do before the color-changing molecules can be used outside the lab.
51．A．throw B．prevent C．create D．keep
52．A．other B．another C．the other D．others
53．A．until B．although C．after D．before
54．A．on B．behind C．under D．down
55．A．for B．in C．from D．at
56．A．nothing B．anyone C．someone D．everything
57．A．why B．how C．what D．where
58．A．color B．trouble C．sound D．time
59．A．strong B．soft C．weak D．hard
60．A．closes B．breaks C．increases D．burns
61．A．results B．rules C．tools D．methods
62．A．repairs B．controls C．finishes D．disappears
63．A．inside B．beside C．outside D．above
64．A．dangerous B．useless C．helpful D．important
65．A．a pair of B．a type of C．a lot of D．a part of
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