完型填空 Do you want to know astronauts’ everyday life in space? They also need to eat, 11 , exercise and relax. They do the same things as us, but they do 12 differently. On the earth, we put food on a plate (盘子)and put water in a glass. Gravity holds the food down and keeps the water in the glass. 13 there is almost no gravity in space, so food can fly away, and astronauts must eat and drink 14 . Sleeping is very different in space. Some astronauts like to float (漂浮)in the air, but most like to be in a sleeping 15 . They tie (系)the bag to a wall so they won't float away. Exercise is very 16 in space. On the earth, your legs 17 your body, but in space, astronauts float, so they don't 18 their legs often. This is very bad for their legs, so they must exercise for thirty minutes every day. After one day's work, astronauts relax. They may listen to music, read books, watch films, play s, or talk to their friends and families 19 the radio. Sometimes they just enjoy floating in the 20 . ( )11. A. play B. work C. sleep D. study ( )12. A. it B. them C.on D.themselves ( )13. A. And B. But C. Because D. Or ( )14. A. loudly B. carelessly C.quietly D. carefully ( )15. A. room B. bed C.bag D.chair ( )16. A. usual B. different C.important D. exciting ( )17. A. carry B. change C.push D. shake ( )18. A. break B. need C. wash D. use ( )19. A. on B. in C.with D. for ( )20. A. cloud B. air C. water D. boat