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.

　　Since gravity doesn’t work in space，astronauts need some extra help to get rid of the tears.Feustel chose to rub his eyes against his helmet to wipe the tears away.Another choice is to just wait—“When the tears get big enough they simply break free of the eye and float around，” astronaut Ron Parise told The Atlantic.

　　There are lots of small things—things like crying—that we are so used to on Earth.We usually take them for granted，until they become a problem in a totally different environment，like space.There，astronauts can’t talk to each other directly.They also can’t eat or drink in normal ways.They can’t even burp(打嗝)(呕吐) everything in their stomachn honestly say，“Gravity，you’re the best.”

　　5．What can we conclude from Paragraphs 2 and 3?

　　A．Astronauts are unable to feel sad in space.

　　B．Astronauts produce fewer tears in space.

　　C．Tears produced in space flow down more slowly.

　　D．Tears produced in space don’t flow downward.

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