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3.How could we tell time if there were no watches or clocks anywhere in the world?
The sun was probably the world's first"clock",except in the far north,where the Eskimos (爱斯基摩人) live.There,it's dark most of the winter,and light most of the summer.But in most of the world,people used the sun for a clock.Even today,if you don't have a clock,you still know that when the sun shines,it's day,and when it's dark,it's night.The sun can also tell you if it's morning,noon,or afternoon.
People near the sea can tell time from the tides(潮汐).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 24hours.
Seamen on a ship learn how to tell time by looking at the moon and the stars.The whole sky is their clock.In some places in the world the wind comes 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(沙) clock is an even better clock.If you had fine dry sand in a glass,you would have what is called an hourglass.The sand in the hourglass goes from the top part to the bottom(底部) part in exactly one hour.When people turn over the hourglass,the sand will take another hour to go back again.

48.How many ways does the passage show us to tell time including the watches and clocks?C
A.8             
B.7
C.5            
D.4
49.The Eskimos in the far north can't use the sun for a clock becauseD.
A.They know very little about the sun
B.The sun there never goes down in winter
C.It's too cold for them to go out to watch the sun
D.It has long dark winters and long light summers
50.The writer thinksB.
A.there are no more than two tides in a day
B.a sand clock is a better clock than the tide
C.only the moon is a good"clock"for seamen
D.the wind can be a clock all over the world
51.In which column(栏目) of a newspaper can you most possibly read this passage?A
A.Science.
B.News.
C.Advertisements.
D.Sports.

分析 文章大意:这是一篇说明文,短文主要介绍了没有手表和钟表,其他的方式也可以给人们指示时间.如太阳的转动,大海的潮汐,通过看月亮和星星来辨别时间,风的变化,以及沙漏等.

解答 48.答案:C.细节理解题.根据短文描述太阳的转动,大海的潮汐,月亮和星星,风的变化,以及沙漏可以指示时间,可知,有五种方法告诉我们判断时间,故选C.
49.答案:D.细节理解题.根据第二段第二句There,it's dark most of the winter,and light most of the summer描述可知冬天的夜太长,夏天的日太长,故选D.
50.答案:B.细节理解题.根据倒数第二行第一句A sand(沙) clock is an even better clock.沙时钟是一个更好的时钟.可知,沙漏是比潮汐更好的时钟.选B.
51.答案:A.来源分析题.A科学.B新闻.C广告.D运动.根据第一句How could we tell time if there were no watches or clocks anywhere in the world?如果没有手表或钟表在世界任何地方?我们怎么辨别时间.及列举的五个辨别时间的方法,可知应该是来源于科学报纸专栏.选A.

点评 阅读题型,要注重句子与句子之间、段落与段落之间逻辑关系以及对篇章的整体理解.根据所给问题选择正确选项完成试题.

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