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发布时间：2006-07-01 07:54     点击：

D.the boy won’t be put into prison

61.The words"motive"probably means______.

A.reason　　　　　　B.action　　　　　　C.motion　　　　　　D.information

62.The man,Sheriff Glover,may be ______.

A.a reporter　　　　　　　　　　　　B.a government official

C.the girl’s father　　　　　　　　　　D.a person in charge of the case

　　　　　　　　　　　　　　　　　　　　　　　　C

There is a very simple way of measuring the height of a water-tower.Which we cannot measure by climbing.

Suppose,for example,that we wish to find out the height of the watertower,AB,in a factory,we first of all go to where the water-tower is standing and measure a distance of,say,90 feet from it,in a straight line,marking the spot that is 90 feet from the water-tower,Then we take a stick,DC,and stand it in the ground at the spot we have just marked.

Let us suppose that the stick we are using is 4 feet in height.We now walk farther away from the water-tower in the same straight line as when we measured off the distance of 90 feet.We go from the water-tower until we come to a point E,where with our head on the ground,we see the top of the stick and the top of the water-tower in the same straight line-that is,the top of the stick just over the highest part of the water-tower.

We now have two triangles(三角形）and the proportion(比例）of the side CD to the side CE,in the smaller triangle CDE,is exactly the same as the proportion of the side BA to the side BE,in the large triangle BAE.It is clear from this that every schoolboy or schoolgirl can work out the height of the water-tower.

Suppose that the line CE is 5 feet.We know that the stick is 4 feet high and the length BE is 95 feet.From these measurements we have the simple proportion sum(算题):5 is to 4 as 95 is to AB.We multiply(乘)95 by 4,making 380,and divided by 5.Then we can get the height of the water-tower.The height of any other building can,of course,be easily measured by using the same way.

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