16．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 downwards.

　　17．What effect do tears have on astronauts?

　　A．They cause physical pain.

　　B．They bring comfort to them.

　　C．They make their vision clearer.

　　D．They float around and cause trouble.

　　18．What can the astronaut do to get rid of the tears?

　　A．Rub his eyes against his helmet to let the tears float forward.

　　B．Rub his eyes with a hand to let the tears float around.

　　C．Get the tears big enough to fall off his eyes.

　　D．Get the tears big enough to break away from his eyes.

　　19．What’s the second­to­last paragraph mainly about?

　　A．Suggestions on how astronauts can stay comfortable in space.

　　B．Other basic things that are difficult to do in space.

　　C．Why burping is impossible in space.

　　D．Things that humans can’t do without gravity.

　　20．Which of the following can be the best title for the text?

　　A．In Space，You can’t Burp

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