C The five clearest role-related behaviours of travellers (in order of relative importance ) Tourist
| takes photos, buys souvenirs, goes to famous places, stays briefly in one place, does not understand the local people
| Traveller
| stays briefly in one place, experiments with local food, goes to famous places, takes photos, explores places privately
| Holidaymaker
| takes photos, goes to famous places, is separated from the local society, buys souvenirs, contributes to the visited economy
| Jet-setter
| lives a life of luxury (奢侈) , concerned with social status, seeks physical pleasures, prefers communicating with people of his/her own kind, goes to famous places
| Businessperson
| concerned with social status, contributes to the economy, does not take photos prefers interacting with people of his/her own kind, lives a life of luxury
| Conservationist
| interested in the environment, does not buy souvenirs, does not exploit the local people, explores places privately, takes photos
| Explorer
| explores places privately, interested in the environment, takes physical risks, does not buy souvenirs, observes the visited economy
| Overseas student
| experiments with local food, does not exploit the people, takes photos, observes the visited society, takes physical risks
| International athlete
| is not separated from their own society, does not exploit the local people, does not understand the local people, explores places privately, searches for the meaning of life
| Overseas journalist
| takes photos, observes the visited society, goes to famous places, takes physical risks, ex plores places privately
|
64．Which of the following behaviours do Tourist, Traveller and Holidaymaker share? A．Stay briefly in one place. B．Buy souvenirs. C．Go to famous places. D．Explore places privately. 65．We can learn that overseas students . A．are curious about the society they visit B．like to do experiments with local food C．take photos as their teachers have instructed D．enjoy taking physical risks because they are brave 66．According to the passage, which of the following is true? A．Three groups are interested in exploring places privately. B．More than two groups live a life of luxury. C．Six groups are fond of taking photos. D．Two groups don't like buying souvenirs. |
得
得速度减小，A错误。
得a加速度减小，所以B错误，由公式
得
得周期增大，所以C正确。整个过程中机械能守恒，所以机械能不变，D错误，