【正文】
night but also it39。s morning, noon, or afternoon When the sun is almost directly(恰好) overhead, it39。s noon. People who live near the sea learn from the tides. In the daytime, for about six hours, the water rises higher and higher on the beach. And then it goes down and down for about six hours. The same thing happens again at night. There are two high tides and two low tides every 24 hours. Seamen on a ship know time by looking at the moon and the stars. The whole sky is their clock. In some places in the world the wind es up at about the same time every day or changes direction or stops blowing. In these places the wind can be the clock. A sand clock is an even better clock. If you had fine dry sand in a glass like the one in the picture, you would have what is called an hourglass. The sand in the hourglass goes from the top part to the bottom part in one hour. When the hourglass is turned over, the sand will take another hour to go back again. ( ) the passage we can know there are_____ ways to tell time except the clock and watch. A. 3 B. 4 C. 5 D. 7 ( ) Eskimos in the far north can39。t use the sun for a clock because _______. A. they know very little about the sun B. the sun there never goes down in winter C. it39。s too cold for them to go out to watch the sun D. it has long day and long light during summers ( )3. The underlined word tides in the passage means_______. A.洋流 B.潮汐 C.海嘯 D.波浪 ( ) page of the newspaper may this passage be in? A. News. B. Science. C. Advertisement. D. Sports. ( )39。s the best title for the passage? A. Different Ways to Tell Time B. How the Clock Was Invented C. The Development of the Clock D. A Useful Machine to Tell Time