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    【题目】阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

    Nearly two decades have passed since China sent the first Beidou satellite into space in 2000. During that time, more Beidou satellites were sent into orbit (轨道), 【1】 (form) the Beidou Navigation Satellite System (BDS). In late 2012, it began providing positioning, navigation, timing and messaging 【2】 (service) to people in China and other parts of the Asia-Pacific region. At the end of 2018, BDS started to serve users worldwide. Now with two more Beidou satellites 【3】 (launch) on Dec 16, 2019, BDS has 53 satellites in orbit.

    【答案】

    【1】forming

    【2】services

    【3】launched

    【解析】

    这是一篇说明文。主要介绍了自2000年中国将第一颗北斗卫星送入太空以来，已经过去了近20年。在此期间，更多的北斗卫星被送入轨道，形成北斗导航卫星系统。文章还说明了从2012年底到2019年期间，北斗系统能提供的功能和完善情况。

    【1】考查非谓语动词。句意：在此期间，更多的北斗卫星被送入轨道，形成北斗导航卫星系统。分析句子结构，form与其逻辑主语Beidou satellites之间是主动关系，用现在分词作结果状语。故填forming。

    【2】考查名词的数。句意：2012年底，该公司开始向中国和亚太地区其他地区的用户提供定位、导航、定时和短信服务。service为可数名词，根据上文positioning, navigation, timing and messaging可知此处服务不止一种，故应用名词复数形式。故填services。

    【3】考查with复合结构。句意：2019年12月16日，北斗系统又发射了两颗北斗卫星，现有53颗在轨卫星。这里是with复合结构，因为“北斗卫星”和“发射”之间是被动关系，所以用with + n + 过去分词结构，所以填launched。

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