The research team put the molecule into a soft material.When the researchers stretched the material，it turned bright red for a few seconds before it broke into two pieces.When they repeatedly stretched and relaxed the material，without breaking it，it only turned a little red.

　　The major problem is that light can get rid of the red color.When the team shone bright light on the molecule，the broken bond was fixed，and the color disappeared.

　　If the bright light keeps the red color from appearing，the material’s warning system will be useless.Scientists still have a lot of work to do before the color-changing molecules can be used outside the lab.

　　16．What does the passage mainly introduce?

　　A．The collapse of an overpass in Zhuzhou，Hunan Province.

　　B．The Sichuan earthquake last year.

　　C．A material that turns red before it breaks.

　　D．A way of preventing building from collapsing.

　　17．The underlined words “racking their brains” in the third paragraph mean ________.

　　A．suffering a lot

　　B．collecting beyond imagination

　　C．losing a lot

　　D．thinking very hard

　　18．Which of the following is a WRONG statement?

　　A．Thousands of people died from the collapse of buildings in the Sichuan earthquake because they hadn’t been warned.

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