Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
____wateristheirenergysource,____tropicalcyclonesareseasonal.
名词解释：abilloflading
Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
Byjointeffortswecan___bothfriendshipandbusiness.()
