2020年高考一輪復習黃金學案――Unit 3 Travel journal（必修一）
it was not until the advent of widespread railroad travel that a need 26 for 27 time. at one point over 300 local times were honored within the 28 , making it literally impossible for trains to arrive consistently on time 29 . as a result, in 1883 the continental united states was divided into four time longitude. the standardization resulting from this system 30 so helpful that in 1884 the international meridian conference applied the same procedure to establish time zones around the world.21. a. areas b. districts c. zones d. divisions22. a. usually b. never c. only d. rarely23. a. made b. established c. arranged d. founded24. a. however b. therefore c. meanwhile d. by contrast25. a. different b. wrong c. incorrect d. mistaken