Question 17-20: Read the following passage and circle the letter A, B, C or D to indicate the answer to each of the following questions. Strange things happen to time when you travel, because the earth is divided into twenty- four time zones, one hour apart. You can have days with more or fewer than twenty- four hours, and weeks with more or fewer than seven days. If you make a five- day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes one hour. Traveling West, you set your clock back; traveling East, you set it ahead. Each day of your trip has either twenty - five or twenty - three hours. If you travel by ship across the Pacific Ocean, you cross the international date line. By agreement, this is the point where a new day begins. When you cross the line, you change your calendar one full day, backward or forward. Traveling West, today becomes yesterday; traveling East, it is tomorrow. 17. The difference in time between zones is .............................. A. seven days B. more than seven days C. one hour D. twenty - four hours 18. From this selection it seems true that the Atlantic Ocean ....................... A. is in one time zone B. is divided into twenty - four zones C. can't be crossed in five days D. is divided into five time zones 19. If you cross the ocean going East, you set clock .......................................... A. ahead by twenty - three hours B. ahead one hour in each new time zone C. back one full day for each time zone D. ahead one hour for the whole trip 20. The international date line is the name for ......................... A. the beginning of any new time zone B. any time zone in the Pacific Ocean. C. the point where a new day begins D. any point where time changes by one hour