短文填空。 In many countries, people t__________ (1) by car or by bike. They also get from place to place using p__________ (2) transport such as buses and trains. However, some people live in parts of the world where it is i__________ (3) to build roads. In these places, animals or other f__________ (4) of transport have to be used. It is difficult to w__________ (5) in snow but easy to ski over it. So in places like Alaska, people use skis. If they want to go faster, they get dogs to p__________ (6) them on sleds (雪橇). Riding a snowmobile (雪地 摩托) is a more m__________ (7), but expensive way of getting around on snow. In desert (沙漠) like the Sahara in North Africa, people s__________ (8) get around on camels. Camels survive w__________ (9) in the desert, not because they can s__________ (10) water in their bodies though! They can survive without water for two weeks and without f__________ (11) for up to a month. H__________ (12) can only go without water for about three to five days.