I don't know Sam's telephone number．Will you please________i

答案B
分析：本题有两个考点,一个是动词短语的意思：look at(注视……),look for(寻找丢失的东西),look up(抬头看),如果要指出看什么,要说成look up at(查寻),如：look up a new word in the dictionary．此处按句意是“在地址簿里查寻电话号码”,应该选look up．另一个考点是look up的宾语应该怎么放.短语动词有“动词+介词”类型的,宾语要放在介词的后面,称为“不可分开的短语”,如：look at the man,look at him．另一类是“动词+副词”构成的短语,称为“可分开短语”,其宾语可以放在后面,也可以放在短语的中间,但如果宾语是代词的话,必须放在短语的中间,如：look up the word／look the word up／look it up(错误：look up it)．(延伸)含有介词at,for,after,of的动词短语总是“不可分开短语”,而含有副词up,down,out,away的短语总是“可分开短语”.但on,in,over可做介词也可做副词,要分别记忆.go over the lesson／go over it(复习)(不可分开)；think over the matter／think the matter over／think it over(考虑)(可分开)；call on his friends／call on them(拜访)(不可分开)；put on a play／put a play on／put it on(演出)(可分开)；join in the army／join in it(参加)(不可分开)；get in the rice／get the rice in／get it in(收)(可分开)