问题 填空题

已知两个相似多边形的一组对应边分别是15cm和23cm,它们的周长差40cm,

则其中较大三角形的周长是           cm.

答案

115

∵一组对应边分别是15cm和23cm,∴相似比k=

设两多边形的周长分别是15x,23x,根据题意,得23x-15x=40,

解得x=5,∴较大多边形的周长是23×5=115cm

阅读理解

阅读理解。

     A very important world problem is the growth of population on the earth. The population of the world

  today is more than 6.5 billion. That is a __1__ number and we know it quite well. The important thing is

  not how large the population of the world is now, but is the rate (速度率) of the growth. It is about 1.63

  percent every year after the number of dead people has been taken away.

     Look at the second hand of your watch. Every second four babies are born in the world. Another

 baby! Another baby! Another baby! You can't speak __2__ enough to keep up with the birth rate. The

  population is growing faster and faster. So it goes on, hour after hour. In one day, people have to find

 food for over 350,000 mouths__3__ .

     This great growth of population will make a big problem by the year 2010-there will be as __4__ as

  7,000,000,000 people on the earth. So this is one of the__5__  problems you are going to see in your

 life.

1. 将下列几个单词分别填入短文所缺的空格中。其中有一个是多余的。

    quick, quickly, biggest, many, more, great 

    1. _____ 2._____  3._____ 4._____  5._____

2. 将短文中画线的句子翻译成汉语。

                                                                      

3. From the passage we know there are about _____ new babies to be born in a minute.

4. The rate of the growth of population every year is about _____.

5. 请为本文选择一个最恰当的标题。

    A. The Number of Dead People

    B. The Growth of Population

    C. The Food Shortage

    D. The Heavy Traffic

不定项选择