Thegovernmentcalledoutpolicementosuppresstheriot.
A
to suppress the riot 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。
Awell-knownexampleofthelargescaledestructionofanecosystemthroughvegetationremovaltoaccommodatetouristfacilitiesisthecaseofthe_______.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
TheNetherlandsistheonlycountryinEuropewhichpermitseuthanasia,________itisnottechnicallylegalthere.