2l.C细节理解题。根据第一段It is one of Tanzania's most visited cities-一it's considered a gateway city to the“safaricircuit'”(狩猎路线)in Tanzania..可知,阿鲁沙是坦桑尼亚游客最多的城市,是因为它是前往该地区狩猎之旅的门户。故选C。22.D细节理解题。根据Cafes下文You can't go far without spotting a caf伦.你走不了多远就会看到一家咖啡馆。由此可知,在阿鲁沙咖啡馆随处可见。故选D。