There is a way to get rid of6 the red color: 13 . When a bright light is shone on the mechanophore, the broken bond is fixed7- and the red color disappears. This self-healing may be a problem for engineers. They need to use the color-changer in big construction projects that will be 14 , in sunlight. And sunlight will make the mechanophores warning system useless.

　　Sottos and her fellow scientists still have 15 work to do before the color-changing molecules can be used outside the lab.

　　练习：

　　1. A measures B accidents C actions D collap-ses

　　2. A they B it C some D most

　　3. A with B over C at D in

　　4. A before B after C once D while

　　5. A together B behind C down D apart

　　6. A contacting B conducting C containing D considering

　　7. A controlled B spotted C repaired D changed

　　8. A technical B electronic C physical D chemical

　　9. A everything B something C nothing D anything

　　10. A weak B strong C tough D soft

　　11. A using B opening C turning D finishing

　　12. A laws B theories C tools D results

　　13. A air B electricity C light D sound

　　14. A aside B beside C inside D outside

　　15. A a part of B a pair of C a piece of D a lot of

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