The United Nations, an accepted authority on population levels and trends, estimates that the world population reached 5.3 billion in 1990, and is increasing annually by more than 90 million persons. The rate of increase, 1.7 percent per year, has fallen below the peak rate of 2 percent per year attained by 1970. However, absolute yearly increments are not expected to start declining until after the year 2000.
Estimates of world population before 1900 are based on fragmentary (不全的；不完整的) data, but scholars agree that average population growth approached approximately 0.002 percent per year. Growth was delayed and influenced by climate, food supply, disease, and war.
Starting in the 17th century, great advances in scientific knowledge, agriculture, industry, medicine, and social organization made possible substantial increases in population. Inanimate (无生命的) energy gradually replaced human and animal labor. People slowly acquired the knowledge and means to control d
A. Past and Present Growth of Population
B. World Population
C. Some Factors on Population Influence
D. Population
The United Nations, an accepted authority on population levels and trends, estimates that the world population reached 5.3 billion in 1990, and is increasing annually by more than 90 million persons. The rate of increase, 1.7 percent per year, has fallen below the peak rate of 2 percent per year attained by 1970. However, absolute yearly increments are not expected to start declining until after the year 2000.
Estimates of world population before 1900 are based on fragmentary (不全的；不完整的) data, but scholars agree that average population growth approached approximately 0.002 percent per year. Growth was delayed and influenced by climate, food supply, disease, and war.
Starting in the 17th century, great advances in scientific knowledge, agriculture, industry, medicine, and social organization made possible substantial increases in population. Inanimate (无生命的) energy gradually replaced human and animal labor. People slowly acquired the knowledge and means to control d
A. Past and Present Growth of Population
B. World Population
C. Some Factors on Population Influence
D. Population
Passage 2
The United Nations, an accepted authority on population levels and trends, estimates that the world population reached 5.3 billion in 1990, and is increasing annually by more than 90 million persons. The rate of increase, 1.7 percent per year, has fallen below the peak rate of 2 percent per year attained by 1970. However, absolute yearly increments are not expected to start declining until after the year 2000.
Estimates of world population before 1900 are based on fragmentary (不全的；不完整的) data, but scholars agree that average population growth approached approximately 0.002 percent per year. Growth was delayed and influenced by climate, food supply, disease, and war.
Starting in the 17th century, great advances in scientific knowledge, agriculture, industry, medicine, and social organization made possible substantial increases in population. Inanimate (无生命的) energy gradually replaced human and animal labor. People slowly acquired t
A. more than 90 million persons
B. 0. 002 percent per year
C. 5.3 billion
D. 500 million
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