Space travel is nothing new.The first spacecraft with a human was sent up into space in 1961.Since then，people have not only traveled to space，but also many of them have lived there in space stations for some time.
    The Soviet Union（前蘇聯(lián)） sent the first space station into space in 1971.This space station was called Salyut 1.Salyut 1 was designed as a place where people could live while they observed space and did a lot of experiments.The first group of astronauts lived there for 23 days.The Soviet Union went on to make seven more Salyut space stjye.aiions.At about the same time，the United States built its own space station called Skylab.
    Astronauts visited and often lived in these space stations for a short time.However，it wasn't until the late 1980s when the Soviet Union sent the Mir space station that people began to live in space for a longer time.Mir stayed in space from 1989 until 2001，when it was decided that the space station was too old and no longer safe to live in.
    Living in space stations seems to be fun，but astronauts face many problems.One of them is food.All the meals on space station are put together on Earth and sent there by space shuttle（航天飛機(jī)）.Because the food has to last a long time（sometimes up to three months），a lot of it has to be stored（儲存） in cans.The space station does not have a fridge，but it has a cool room to keep fruit and vegetables fresh.Astronauts also eat many other foods such as dried meat that do not need special care.
    Without the help of gravity（重力），sitting down to eat can be tough.Astronauts sometimes have to fix themselves to the wall while eating.They also have to be very careful so that food does not float away（漂走）.

The first spacecraft with a human was sent up into space in 1961.	Living for a short time： ?The Soviet Union sent the first space station called Salyut 1 into space in 1971，in which people could （2） not only not only live but also but also do observation and experiments. The United States built its own space station-Skylab at about the same time.	Living for （3） a long time a long time . ?In the late 1980s，the Mir space station was sent by the Soviet Union. ?Mir kept working in space from 1989 until 2001.
The （1） advantage advantage of it
Travelling and living in space
One of the problem astronauts face in the space station-food
（4） Solutions Solutions to the problem： ?They need to put all the meals together on Earth and send them there by space shuttle. ?The space station just has a cool room to keep fruit and vegetables fresh. ?Astronauts also cat many canned food and dried meat. ?Sometimes astronauts have to fix themselves to the wall while eating.They should also deal with the food carefully in order to （5） stop stop the food from floating away.