The government called out policemen to suppress the riot.
A
tosuppresstheriot在句子中是作目的状语，表示“警察来是镇压动乱的”，所以答案为A。
Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
In1995,anaverageof_______ofdomestictravelerswentonsightseeinginChina.
______aretheprimarydestinationsfortheChineseatpresent.
TheWesternCouncilforTravelResearchin_______employedthetermvisitor.
In1985,_______becamethefirstinternationalhotelcompanytoopenahotelinChinabearingitsownname.