24．From the passage we can learn that some people are worried because________.

　　A. they have evidence that the use of cell phones can lead to cancer

　　B. they feel surprised and alarmed about cell phone use

　　C. some experts have given a warning

　　D. cell phones are responsible for brain tumors

　　25．By saying “I don’t support warning labels for cell phones，”Dr Martha Linet has the idea that_______.

　　A. the worrying is unnecessary

　　B. cancer—warning labels should be on cell phones

　　C. there is a link between cell phones and cancer

　　D. cell phones have nothing to do with cancer

　　26．Which of the following best describes the attitude of the author towards the debate?

　　A. Optimistic．

　　B. Objective．

　　C. Opposite． D. Casual．

　　27．The underlined word“ justified” in Paragraph 3 is closest in meaning to_____．

　　A. explained

　　B. confirmed

　　C. classified

　　D. restricted

　　C

　　Can you believe your eyes? A recent experiment suggests that the answer to that question may depend on your age．

　　Martin Doherty，a psychologist at the University of Stirling in Scotland，led the team of scientists．In this experiment，Doherty and his team tested the perception(观察力)of some people，using pictures of some orange circles．The researchers showed the same pictures to two groups of people．The first group included 151 children aged 4 to 10，and the second group included 24 a—dults aged 18 to 25．

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