一道英语的阅读理解How could we tell time if there were no watches or

一道英语的阅读理解
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 have used the sun fooday,if you don’t have a clock that shows time,you still know that when the sun shines,it’s day,and when it’s dark,it’s night.The sun can not only tell you whether it’s day or night but also it’s morning,noon,or afternoon.When the sun is almost directly overhead,it’s noon.
People who live near the sea from the tides.In the daytime,for about six hours,the water rises higher and higher on the beach.And then it 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 leall 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 clock is an even better clock.If you had fine dry sand in a
glass shaped like the one in the the sand will take another hour to go back again.
51.From the passage we can know there are _____ ways to tell time besides the clock and watch.
A.3 B.4 C.5 D.7
52.The Eskimos in the far north can’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.it’s too cold for them to go out to watch the sun
D.it has long da and long light summers
53.The underlined word “tide” in the passage means _______.
A.洋流 B.潮汐 C.海啸 D.波浪
54.In which page of the newspapost probably read this passage?
A.News.B.Science.C.Advertisement D.Sports.
55.What’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
看第51题为什么答案是5种?我觉得是7种啊.因为他的意思不是包括表和钟有几种吗?
1搂在说什么？

51. C
besides意思是“除...之外”,的确也包括the clock and watch在内,但是前面ways的数量却不能把the clock and watch计算在内.
呵呵,我只是觉得楼主的思维有点出位,别怪哦!
这五种分别是：the sun, the tides, the whole sky, the wind和the sand.
再如：There are five students in the classroom besides Tom and Mary.
翻译为：教室里除了Tom和Mary之外,还有5个学生.（总共7个学生在教室内）
52. D (如果楼主B没打错字的话)
53. B
54. B
55. A