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20[填空题]
全球定位系统GPS所采用的坐标系为                     。
  积分
控制测量
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  •  How can you get travel information?    There are several ways you can find out the countries and places you wish to visit. If your friends have been there，you can talk to them. They may give you detailed and vivid descriptions about the places. Most important of all， they can offer some valuable advice for the trip. For example， which part is more interesting than others? How can you enjoy yourself better? What should you pay more attention to? The advice is all from their own experience.    Another way is to consult a travel agency. An experienced agent may offer you a lot of information. Above all, they are always ready to help.    Besides, you can also read travel books. They are helpful too. Sometimes， they are better than a friend or a travel agency, because you can always read them whenever you want..    Decide the best answer from each group of choices according to the passage.16.When people are planning a tour, they can _________ for information about the places they wish to visit.                                                                          A. talk to a friend                 B. read a travel bookC. go to a travel agency     D. do all of the above17.The word consult in para.2 means ______.                                A. give information         B. give adviceC. ask for advice             D. ask for a travel book18.The advantage of consulting a travel agency is that _____ .                  A. any agent can give you a lot of informationB. they are always ready to help  C. the agents are all experiencedD. their service is free of charge19. A travel book is sometimes better than a friend or a travel agency, because___. A. it gives you more information                B. it is cheap to get one   C. you can read it whenever you want      D. you can get it everywhere20.Which statement is not true?                                           A. Friends may give you detailed and vivid descriptions about the placesB. A travel book is sometimes better than a friend or a travel agencyC. Travel agencies are not ready to help.D. You can read a travel book whenever you want. 大学英语（I）
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