8．B 推理题.根据The gas is a waste product of living creatures and could be produced by microbes living in the red planet’s soil可知.火星大气层中存在甲烷的迹象.而甲烷是活着的动物产生的废物.据此科学家推断这可能是生活在火星上的微生物产生的.故可得出结论:火星上可能存在微生物.主要证据是火星在大气层中发现了甲烷的迹象. C BTB BUS COMPANY The BTB BUS Company serves all parts of the city, and also provides an extensive service to nearby towns and villages. BTB CITY BUSES are usually orange, and operate from 06∶30. There are four kinds of tickets you can use: Tourist Ranger is the ideal ticket for tourists and visitors to the city. The tickets are valid for 2, 3 or 5 days, and can be used on all city buses. They cost ￡4, ￡5.5 and ￡7.50. Monthly Season — Going to work by bus? This is the one for you! For only ￡26.5 you have the freedom of the city for a whole calendar month. Bus Card — lasts for one day. For ￡2.50 you can travel anywhere on the bus system for one day — but you must clip your card in the machine every time you board a bus. Single Journey — 50p, valid for just one journey. Clip the ticket when you get on the bus. Books of ten tickets also available. These tickets are only valid on BTB City Buses. They are available from post offices, tobacconists and BTB offices. TICKETS CANNOT BE PURCHASED ON THE BUSES. BTB COUNTRY BUSES (which are usually blue) serve the towns of Conby, Rashville and Grill as well as numerous villages in the area. Services run from 07∶00 to 21∶30. Tickets are bought on the bus. The minimum fare is 75p, increasing with distance. Buses depart from the main railway station and Coshley Square. A MAP of the routes for both City and Country buses can be obtained from the BTB offices at the main railway station or 27 Part Square. Timetables for both services can be found at the bus stop. 【
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