谷军回答：
arccosx的定义域是[-1,1]
-1
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连词成句.1、most,expensive,which,the,is,guitar,2、one,this,the,is,worst3、boy,is,the,coldest,the4、these,must,be,world,the,in,the,longest,trousers.5.is,the,which,bike,most,expensive,here?6.the,one,here,is,best.7.giraffe,tallest,theis,world
【将下列单词中的不可数,可数名词分类放入框内peach,jam,car,knife,ink,water,shirt,orange,rain,tea,fridge,sister.可数：不可数：还有garden，snow，ear，lemonade，spoon，coffee，picture，wind，ice，teacher，sofa，cooke】
