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题目内容
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Population tends to grow at an exponential(指数的)rate. This means that they progressively double. As an example of this type of growth rate take one penny and double every day for one month. After the first week, you would have only 64 cent, but after the fourth week you would have over a million dollars.
This helps explain why the population has come on“all of a sudden” took from he beginning of human 1ife to the year 1830 for the population of the earth to reach one billion. That repents(缓慢进行) a time span of at least two million years. Then it took from 1830 to 1930 for world population to reach 2 billion. The next billion was added by 1960 only thirty years and in 1975 world population reached 4 billion which is another billion people in only fifteen years.
World population is increasing at a rate of 9, 000per hour, 220,000 per day and 80 million per year.
This is not only due to higher birth rate, but to lower death rate as well. The number of births has not declined at the same rate as the number of deaths.
Some countries such as Columbia, Thailand, Morocco, Costa Rica and the Philippines are doubling their population about every twenty-one years with a growth rate of 3.3 percent a year or more. The United States is doubling its population about very eighty-seven years, with a rate of 0.8 percent per year.Every time a population doubles, the country involved needs twice as much of everything, including hospitals, schools, resources, food and medicines to care for its people. It is easy to see that this is very difficult to achieve for the more rapidly growing countries.
This passage chiefly discusses
A.the growth of world population.
B.one type of the exponential rate
C.the population problem of more rapidly growing countries.
D.the possible ways of dealing with the rapid population growth
According to the passage what helps to explain why the population problem has come on “all of a sudden”？A.The penny that doubles itself every day for one month
B.The time span of at 1east two million years in human history.
C.An illustration of the exponent growth rate given by the author.
D.The large amount of money you would luckily make after the fourth week
Which of the following statements is NOT true？A.World population is increasing at a rate of 150 per minute
B.Lower death rate also contributes to world population growth
C.The population of Columbia has been doubling every year for 21 years.
D.The United States is usually doubling its population on about every 87 years.
It took ______ for the world to increase its population from 1 billion to 4 billion.A.100 years
B.175 years
C.1975 years
D.over two million years
When a population doubles, the country involved needs twice as much of everything including __.A.hospitals and medicines
B.schools and students
C.food and manpower resources
D.all of the above
请帮忙给出每个问题的正确答案和分析，谢谢！
更多“Population tends to grow at an exponential（指数的)rate. This means that they progressively”相关的问题
第1题
A、population growth is generally best controlled by sexual restraint
B、the scientific method is the best approach to uncovering the processes by which both physical and human events occur
C、population tends to increase faster than the supply of food available for its needs
D、various kinds of external forces, such as famine, disease, help control the population growth
第2题
A．they can write and read
B．they can build cities and record thoughts
C．their population tends to increase
D．they have special abilities
第3题
A．they are able to make innovations
B．they can build cities and record thoughts
C．their population tends to increase
D．they have special abilities to use ax
第4题
A．Migration is in most cases dictated by life course events as opposed to the economic factors that contribute to the development of cities.
B．Population growth tends not to affect the availability of proxies for replacing emigrants from population centers.
C．Sedimentary populations are more historically significant than nomadic or migratory ones.
D．It is permissible to rely upon a single source of information in studying population movement patterns.
E．Migration can be disregarded as a demographic pattern in historical contexts prior to the development of large cities.
第5题
A．they can write and read
B．they can build cities and record thoughts
C．their population tends to increase
D．they have special abilities
第6题
A．Migration is in most cases dictated by life course events as opposed to the economic factors that contribute to the development of cities.
B．Population growth tends not to affect the availability of proxies for replacing emigrants from population centers.
C．Sedimentary populations are more historically significant than nomadic or migratory ones.
D．It is permissible to rely upon a single source of information in studying population movement patterns.
E．Migration can be disregarded as a demographic pattern in historical contexts prior to the development of large cities.
第7题
Natural selection can serve to stabilize a population if the new traits, called mutations, are eliminated when they appear because they are not as well-adapted to the environment. The opposite effect is obtained when a new trait is introduced which allows individuals to adapt better over time, the species will change as this mutation becomes more widespread in the population. In human beings, increased brain size helped individuals to adapt better, and so brain size increased gradually in the species. Changes in the overall genetic makeup of a population are normal when there are environmental changes, especially sever environmental disruptions. Specialized adaptations to specific environments can lead, over time, to the development of subpopulation of individuals, ones who are better adapted to particular soil conditions food sources and so on. Given enough time, these subpopulations may develop into separate species, such as zebras and horses, living in distinct environments and not interbreeding.
Individuals in a population differ from one another because______.
A．they have different success generation by generation
B．they are ill-adapted and eventually die out
C．they have different genetic inheritances
D．they want to survive and reproduce successfully
第8题
What is true about the pre-modern era？
A．People feel worried about taking omnibuses, horse railways, commuter trains, and electric trolleys.
B．People are eager to live and shop in the far away place.
C．Middle class group tends to move out of the city
D．There is an exploration in urban population, esp. very large cities.
第9题
A．Migration is in most cases dictated by life course events as opposed to the economic factors that contribute to the development of cities.
B．Population growth tends not to affect the availability of proxies for replacing emigrants from population centers.
C．Sedimentary populations are more historically significant than nomadic or migratory ones.
D．It is permissible to rely upon a single source of information in studying population movement patterns.
E．Migration can be disregarded as a demographic pattern in historical contexts prior to the development of large cities.
第10题
根据材料请回答 31～35
Natural Selection
Natural selection describes the biological process in which the differences of individu-als within a population influence their abilities to survive and reproduce in an environment.The differences in individuals are a result of their genetic inheritance from their parents.In a population, any characteristic which blocks reproduction tends to decrease generation by generation.In time, the ill-adapted die out.On the other hand, the individuals who do survive and reproduce will tend to produce offspring(后代which are better adapted to the environment.Natural selection tends to promote adaptations that will increase the organ- ism's(生物体)ability to survive in an environment.
Natural selection can serve to stabilize a population if the new traits, called mutations (突变), are eliminated when they appear because they are not as well-adapted to the envi-ronment.The opposite effect is' obtained when a new trait is introduced which allows indi-viduals to adapt better over time, the species will change as this mutation becomes more widespread in the population.In human beings, increased brain size helped individuals to adapt better; and so brain size increased gradually in the species.Changes in the overall genetic makeup of a population are normal when there are environmental changes, espe-cially severe environmental disruptions.Specialized adaptations to specific environments can lead, over time, to the development of subpopulation of individuals, who are better a- dapted to particular soil conditions, food sources and so on.Given enough time, these subpopulations may develop into separate species, such as zebras(斑马)and horses, living in distinct environments and not interbreeding.
第 31 题 Individuals in a population differ from one another because__________.
A．they have different success generation by generation
B．they are ill-adapted and eventually die out
C．they have different genetic inheritances
D．they want to survive and reproduce successfully
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