By the 1960s and 1970s fast foods became mone of American's strongest exports _________________________________(随着麦当劳、汉堡王扩展到欧洲和世界其他地区).
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_____________________________________________(快餐业的重要开拓者之一)was a man named Carl Karcher.
_______________________(人们觉得)really cool to go to a drive-in restaurant for a burger or hot dog.
Imagine____________No Carhops__________No Waitressess__________No Dishwashers___________No Bus Boys__________________________________________.(麦当劳模式是全自助的)
Evert Carl Karcher, the man who began with one hot dog cart, _________________________________________________.(也以“卡乐星”为名开了自己的快餐连锁店)