新理念英语学习大厅的测试参考答案unit03
LT
综合单元测试——Level 5 Unit 3
work
Listening Comprehension
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True Or False
F F F T F    F T F T F
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Spot Dictation
Directions: In this part of the test, you will listen to a passage and it will not be written
out in full for you. You will hear the passage THREE TIMES. While listening, you are required to fill in the blanks with the exact words you hear. (10 points)
    Populations tend to grow at an exponential rate. This means that they  11  . As an example of this type of  12  , take one penny and double it every day for one month. After the first week you would have only 64 cents, but after the fourth week you would have over a million dollars.
    This helps explain why the population has come on "  13  ." It took from the beginning of human life to the year 1830 for the population of the earth to reach one billion. That represents a  14  of at least two million years. Then it took from 1830 to 1930 for world population to  15  . The next billion was added by 1960, only thirty years.
      16  is increasing at a rate of 9,000 per hour, 220,000 per day, 80 million per year. This is not only due to high  17  , but to lower death rates as well. The number of births has not declined at the same rate as the number of deaths.
    Some countries, such as Colombia, Thailand, Morocco, Costa Rica and the Philippines, are doubling their populations about every twenty-one years, with a growth rate of 3.3 percent a year or more. The United States is doubling its population