D．disasters

　　解析：选A　根据上文带孩子学游泳的经历可知，作者总是和孩子一起面对挑战。

　　.阅读理解

　　(2017·黑龙江四校高三联考)Humans: it's time to abandon Earth or race extinction.

　　It could be the plot of a summer blockbuster (大片), but this prediction isn't science fiction. It's a glimpse of the future, according to famous British scientist Stephen Hawking.

　　“I see great dangers for the human race，” he said in an interview with global forum Big Think. “There have been a number of times in the past when its survival has been a question of touch and go.”

　　“I believe that the long­term future of the human race must be in space，” he said.“ It will be difficult enough to avoid disasters on planet Earth in the next hundred years, let alone the next thousand, or million.”

　　Hawking, who was awarded the Presidential Medal of Freedom last year, has recently voiced many concerns about the future of life on Earth.

　　“If aliens visited us, the outcome would be as much as when Columbus landed in America, which didn't turn out well for the Native Americans，” he said. “Such advanced aliens would perhaps become nomads (游牧民), looking to conquer and colonize whatever planets they can reach.”

　　But Hawking says he's still hopeful for the future of humanity.

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