来源：www.ziyuanku.comB．He is a careless person.

　　C．He tries something to reward those who have done much community service.

　　D．He tries his best to find Elizabeth and do something to reward her.

　　B

　　(2015·河南省实验中学检测)Being an astronaut sounds cool，doesn’t it？In space，they get to do some pretty amazing things，like floating in zero gravity.

　　However，there are also plenty of things that astronauts can’t do because of their weightless environment，and that’s very sad.What’s worse，they can’t even let their sadness show—because it’s impossible to cry in zero gravity.

　　Of course，astronauts can still produce tears.But crying is much more difficult in space，reported The Atlantic in January.Without gravity，tears don’t flow downward out of the eyes like they do here on Earth.This means that when you cry in space，your tears have nowhere to go—they just stick to your eyes.

　　Astronaut Andrew Feustel experienced this during one of his spacewalks.“Tears，”he said，“don’t fall off your eyes...They just kind of stay there.”

　　Besides making your vision unclear，this can also cause physical pain.Back on Earth，tears are supposed to bring comfort to the eyes.But that’s not the case in space.The space environment dries out astronauts’ eyes，and when tears suddenly wet the eyes，it can cause pain rather than comfort.“My right eye is painful like crazy.”Feustel told his teammate during the walk.

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