China’s BeiDou Navigation Satellite Syst...

China’s BeiDou Navigation Satellite System, whose positioning ________ will reach 2.5 meters by 2020, will soon provide services for more countries.

A. accuracy B. category

C. function D. reference

A 【解析】考查名词。A. accuracy精确度； B. category种类，分类； C. function功能； D. reference参考。句意：到2020年，中国北斗导航卫星系统的定位精度将达到2.5米，不久将向更多国家提供服务。结合句意可知答案为A。

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