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[主观题]
World population before 1900 increased slowly, at 0.002 percent per year, or 20 per millio
n inhabitants.
A．Y
B．N
C．NG
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A．Y
B．N
C．NG
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更多“World population before 1900 i…”相关的问题
听力原文： Rats are the enemy of human beings. They eat or spoil crops of grain and rice before they can be harvested, or while they are in storage. In India, where millions of people go hungry, there are ten times as many rats as people. Rats devour half of the available food. Rats will also attack birds and animals, from frogs and chicks to geese and young calves. They have even destroyed dams and buildings by making holes through or under them, and have started fires by chewing on electrical wiring.
The most terrible destruction caused by rats, however, has come from the diseases they carry. In the fourteenth century, rats caused the death of one-third of the world's population by transmitting the dreadful Black Plague that mined Europe.
Ironically, it is in fighting diseases that rats have been most useful to humanity. Thousands of specially bred rats are used in research laboratories every year to test medicines which can possibly be used to prolong and improve human life. Some laboratory rats are even used to test new methods of eliminating their cousins, the wild rats.
(23)
A．The Black Plague.
B．Enemy of Humanity.
C．Common Animal pests.
D．Causes of World Hunger.
The population of the world today is about ______.
A．40 million
B．4 billion
C．400 million
D．40 billion
It is expected that the world's population will reach ______ by the end of the century.
A．2 billion people
B．4.4 billion people
C．80 percent of all people
D．6.4 billion people
18 Most of the world's population may live within 100km of the sea in 2025.
A Right B Wrong C Not mentioned
Which country has the second ______ population in the world？
A．largest
B．most
C．great
CROWDING THE PLANET
This chart shows how much the world's population grew between 1900 and 2000, and how much experts believe it will grow by 2025. The numbers are in billions.
What was the world population in 1950？
A．Half a billion
B．2 billion
C．2.5 billion
D．5 billion
According to the author, Australia ______.
A．has a population of twenty million
B．is a vast country that needs a bigger population
C．constitutes one-fourth of the world's population increase every year
D．has a population that happens to be one-fourth of the yearly world increase
Most of the world's population may live within 100 km. of the sea in 2025.
A．Right
B．Wrong
C．Not mentioned
A．300 million
B．600 million
C．6 billion
D．10 billion
By the year 1998 the world's population reached 6 billion.
A．Right
B．Wrong
C．Doesn't say
