【題目】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

【答案】D

【解析】句意:藍(lán)牙是一種無(wú)線技術(shù)，能使得手機(jī)、無(wú)線耳機(jī)等交換無(wú)線信號(hào)，以便人們可以在W米內(nèi)相互聯(lián)系對(duì)方。match 意為“匹配”; share意為“分享”; protect意為“保護(hù)”; exchange意為“交換”。

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