A.too much population will one day lead to the doom of human beings
B.the trend of population growth will keep unsteady until the destruction of Earth
C.demographic growth will follow a certain pattern of ups and downs
D.it is likely in the near future that population will reduce gradually
A.Species competition.
B.Low fertility.
C.Tribal fights.
D.High mortality.
A.people are permitted to have more children
B.people can live better than before
C.newborn babies die less than before
D.we have found the secret of longevity
A.Eighty million.
B.Eight thousand.
C.Fifty thousand.
D.Five million.Passage Two