There is a way to get rid of the color.light.When a bright light is shone on the mechanophore.
The broken bond is fixed and the red color____________(62).Thisself-healingmay be a Problemfor engineers.They need to use the color changer in big construction projects that will be
(63)in sunlight.And sunlight will make the mechanophores warming system_________(64). Sottos and her fellow scientists still have______________(65)work to do before.The color switc. hing 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.what D.where
59.A.strong B.soff C.weak D.time
60.A.closes B.breaks C.increases D.bums
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
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