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 colour­changing material can turn red before it breaks.

　　4．What can we infer from the passage?

　　A．The colour­changing molecules are certain to be used outside the lab.

　　B．There will be no collapse with the help of the colour­changing 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.

　　(二)

　　The sound of a mosquito can mean trouble in many parts of the world. The bite of the mosquito can be deadly. The insects carry serious diseases like malaria. It is estimated that almost 630,000 people died from malaria and malaria­related causes in 2017, and most of these cases were in African countries.

　　In the United States, a group of California scientists are working to develop a more effective and less costly substance(物质) to protect people from mosquitoes. The researchers are investigating the sense of smell in mosquitoes. They found the insects use the same receptor(感受器) for identifying carbon dioxide in human breath as they do for the smell of our skin. Anandasankar Ray, who is leading the investigation, says scientists tested more than a million chemical compounds(化合物) until they found a substance called Ethyl pyruvate. He says Ethyl pyruvate makes the mosquitoes' receptors inactive.“When we apply Ethyl pyruvate to a human arm and offer it to hungry mosquitoes in a cage, very few of the mosquitoes are attracted to the human arm because only a few of them are able to smell it out，” said Ray.

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