In many countries，people t （61）by car or by bike．They also get from place to place using p （62）transport such as buses and trains．However，some people live in parts of the world where it is i （63）to build roads．In these places，animals or other f （64）of transport have to be used．
It is difficult to w （65）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 （66）them on sleds（雪橇）．Riding a snowmobile（雪地摩托） is a more m （67），but expensive way of getting around on snow．
In desert（沙漠） like the Sahara in North Africa，people s （668）get around on camels．Camels survive w （9）in the desert，not because they can s （70）water in their bodies though!They can survive without water for two weeks and without f （71）for up to a month．H （72）can only go without water for about three to five days．