语法填空（共io小题；每小题i分，满分io分）
Stopreadingforaminuteandthinkaboutwhatyouseewhenyoulook upintheskyonaclearnight.You37.____________ seemanystars.Long longagofarmerswatchedsomestars38.___(know)whentoplant
theircrops.Travellersdidsotofind39._waysinthedark.Today starsareveryimportant40.___somepeople.
Scientistsfindoutthatmoststarsareverybig.Infactsomestarsareso farawayfromus 41.____________itwilltakemillionsoflightyears 42. ____________(get)tothemevenbyspaceship.
Anotherthingweknowtodayaboutstarsisthatsomearemadeupof hotgases.The43.___(gas)aresohotthattheysendoutlight.If youoftenlookup44.___astarcarefullyatnightyoumayfindit twinklessometimes.Asyoumayunderstandlightfromastarmustshinethroughtheairbeforeyoucanseethestar. Airisalways45.____________(move)anditmakeslightfromthestarmove.Whenthelightmovesitmakesthestartwinkle.Starsalsohavedifferentcolours.Tooursurprise
thecoolstarsareredandthe46.____ (hot)onesareblue-white.
37.___ 38.______ 39._______40.______ 41._______
42.___ 43.________44.______ 45.______ 46._______