题目

【小题1】The Internet makes our life nicer, __________(容易的) and more colourful than before.【小题2】A high-speed railway ___________(在….之间) Beijing and Shanghai will be in use soon.【小题3】－Sue，what did you do last Sunday?－I __________(买) a birthday present for my Dad.【小题4】 Nancy, I can’t understand the meaning of this word.－Please look it up in your ___________(字典).【小题5】 －Would you please ____________(邮寄) the letter for me?－With pleasure.在△ABC中，AB＝5cm，AC＝4cm，BC＝3cm． (1)以C为圆心，2.5cm长为半径的圆与AB有怎样的位置关系？ (2)若以点C为圆心的圆的半径为r．问当r取何值时，C与边AB只有一个公共点？