Questions 26 to 29 are based on the passage you have just heard.
26 Who are the most likely to get skin cancer?
27 What is the doctors advice to people?
28 Which is the most effective in protecting people from harmful sunrays?
29 Which of the following is not true about sunscreen?
Passage Two
Now, teenagers are using a cell phone ring tone that many adults cannot hear. The sound that the cell phone releases is a very high frequency or pitch. Many older people are not able to hear the ring tone. Teenagers are using it to communicate during school classes. Students are supposed to have their cell phones turned off during classes. But some students use the ring tone so they can send text messages to each other during class without their teachers knowing. For example, the frequency of normal talking is as high as eight kilohertz. The frequency of the ring tone is said to be about seventeen kilohertz. Over time, most adults over the age of forty or fifty lose their ability to hear high frequency sounds. So most young people can hear the ring tone but many older people cannot.
A British security company first created the sound and called it the Mosquito. The Mosquito device was used to solve a problem for British storeowners. Many teenagers gathered in stores without buying anything. Storeowners used the Mosquito sound to make the teenagers leave the store. The Mosquito sound was reinvented as a ring tone for cell phones.
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