Space suits don't just make astronauts look cool.Without these （1） 　 　suits，astronauts wouldn't be able to leave their spaceship.That is to say，they wouldn't be able to

（2） 　 　on the Moon or work outside the International Space Station.

Space is a （3） 　 　place for human beings.Firstly，there is no air to breathe.Secondly，space also has high levels of radiation（辐射），energy that can pass through our bodies and make us（4） 　 　.Thirdly，some parts of space are really cold （5） 　 　other parts are very hot.So astronauts could die in just a few seconds if they（6） 　 　outside their spaceship without their suits.With a space suit，though，astronauts can move around in space for several hours.

Space suits keep astronauts（7） 　 　 sealed（密封的）inside.A backpack sends O2 in to let astronauts breathe normally.At the same time，the CO ₂ （8） 　 　 astronauts breathe out is sucked away.The suit also protects them from harmful radiation and fast﹣moving space dust. （9） 　 　 the space suit is another suit that looks like a pair of tight pajamas（睡衣）with little pipes running through them.Water runs through these pipes to（10） 　 　 astronauts because wearing a space suit can make astronauts very hot !

（1）A.private	B.special	C.plastic	D.expensive
（2）A.run	B.walk	C.live	D.surf
（3）A.funny	B.natural	C.beautiful	D.dangerous
（4）A.sick	B.bored	C.strong	D.relaxed
（5）A.after	B.since	C.before	D.while
（6）A.rushed	B.jumped	C.stepped	D.escaped
（7）A.safely	B.quickly	C.quietly	D.terribly
（8）A.who	B.this	C.that	D.whether
（9）A.Above	B.Under	C.Behind	D.Between
（10）A.wash away	B.warm up	C.cool off	D.clean out