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 color-changing material can turn red before it breaks.

　　19．What is the major problem in the research of the color-changing material?

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

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

　　C．The material’s warning system is useless.

　　D．The molecules only change color in the lab.

　　20．What can we infer from the passage?

　　A．The color-changing molecules are certain to be used outside the lab.

　　B．There will be no collapse with the help of the color-changing material.

　　C．There is a long way to go before the material can be applied.

　　D．The problem caused by bright light will be solved by scientists.

　　Ⅲ. 任务型读写

　　Attention deficit (不足) hyperactivity (活动过度) disorder is known by the letters A．D.H.D.Children with A．D.H.D.might have trouble paying attention.They might not seem to listen and might forget things.They might not be able to stay seated or play quietly.They might talk too much，act and speak without thinking about the results of their behavior.These are among the signs named on the website of America’s Centers for Disease Control and Prevention.

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