解析：细节理解题。根据最后一段“While earth is the only planet known to support life, s to live on other planets.”可知选B。nology.

　　D．Space exploration may help us avoid potential problems on Earth.

　　解析：主旨归纳题。文章主要说明了太空探索可以帮助避免很多潜在的危险的发生。________ (draw) 100 million users.By September，2017, it 7.________ (reach) the 200 million mark, Tencent said.

　　The number of people 8.________ (use) WeChat, a voice­messaging service developed by the Internet giant Tencent Holdings, has hit 300 million in the less than two years 9.________ the service was released, the Shenzhen­based company said on Wednesday.

　　“The 300 million number is 10.________ milestone for WeChat, and we hope the service will be ready to perform 11.________ the global stage in 2017，” Pony Ma, Tencent chairman and chief executive officer, said on his microblog on Wednesday morning.

　　The function of WeChat is very similar to the text messaging and voice call services12.________are provided by telecom carriers.Late last year saw the13.________(introduce) of an English version of WeChat in a bid to draw more international users.Tencent has released versions in Arabic, Italian, Vietnamese, Japanese and Thai.

　　Tencent said it is 14.________(most) pursuing its expansion plans in emerging and Asian markets.It said the company finds15.________easier to reach its goals in such places, in part because they have cultures that are similar to China's.

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