Unit 3 Environmental Protection 单元限时小卷-【高中必刷题】2023-2024学年新教材高中英语选择性必修第三册同步课件（人教版2019）

03 单元限时小卷 建议用时：56分钟 1 [辽宁辽东区域教育科研共同体2023高二期中] You've probably heard about dogs that have been trained to smell cancer in humans. But what about ants doing the same job? A team of scientists have found that ants can use their keen sense of smell to detect cancerous cells. For their study, the team led by researchers from Sorbonne University in Paris, France, turned to the silky ants, found throughout Europe. They began by exposing individual ants to two tubes—one empty and the other containing a solution with cancerous cells. When the insects went towards the latter tube, they were rewarded with a sugar solution. It took the clever creatures just 30 minutes to associate the diseased cells' distinct smell with the treat. The scientists tested the insects' cancer-detecting ability by removing the sugar solution. They found that the ants continued to move towards the tube about nine times before realising it was gone. 刷阅读理解 2 The team then tested to see if the insects could differentiate between different kinds of cancer. They trained two groups of ants to associate the sugar solution with the unique smells of two types of breast cancer. Once again, the insects chose the smell they had been exposed to long after the sugary solution had been removed. The researchers, who published their findings in the journal Cell on February 22, 2022, next hope to determine if the insects can detect cancer when the diseased cells are not removed from normal cells. They also plan to investigate if they can find out cancer from body fluids like saliva or sweat from patients. “Dogs are good at sniffing out cancer, but the training process is time-consuming. The study shows that ants have high potential, are capable of learning very quickly, at lower cost, and are efficient,” said CNRS. 【语篇导读】本文是一篇说明文，主要介绍了一组科学家通过实验发现蚂蚁可以用它们敏锐的嗅觉来探测癌细胞。 刷阅读理解 3 1.What is the main idea of Paragraphs 2—4?( ) B A.The result of the experiment. B.The process of the experiment. C.Th