雅思阅读：十类信号词需注意
A、数字类：data,figure,rate,ratio,percentage,propotion,demography,statistics,number(of),one, two,…,first,second...etc(雅思阅读基本信号词中最常见的一类) B、时间类：day,week,month,March,July,..,1946,1997,…,year,quqrter(-ly),future,now, past,present,recent(-ly),early,late,last...