Bluetooth is a radio-technology allowing cell phones, wireless earphones, etc. to ______ radio signals, so that people can contact each other within 10 metres.
| A．match | B．share |
| C．protect | D．exchange |
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Bluetooth is a radio-technology allowing cell phones, wireless earphones, etc. to ______ radio signals, so that people can contact each other within 10 metres.
| A．match | B．share |
| C．protect | D．exchange |
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