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 color­changing 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.

　　B．There is no building that will never collapse.

　　C．A new material has been applied to buildings to warn people of collapse.

　　D．A color­changing material can turn red before it breaks.

　　19．What is the major problem in the research of the color­changing material?

　　A．Bright light can get rid of the red color.

　　B．When the material is relaxed，the color disappears.

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