There is the apparent paradox ( ) the effective cause of the high proportion of the old is births rather than deaths.

One major obstacle to economic development is population growth. The populations of most developing countries grow at a rate much faster than that of in dustrialized countries. One reason for this growth is the high crude birth-rate—the number of live births per 1,000 people.（） A: to B: The populations C: that D: live births

There has been a great __________ in the number of births in these parts five years. A: advancement B: skip C: aise D: leap

The<br/>birth _____ is the number of births compared to the number of the<br/>people. () A: speed B: rate C: frequency D: percentage

Which of the following terms is EXCLUDED from the scientists’ Demographic Research() A: Statistics of births. B: Statistics of deaths. C: Statistics of breast feeding. D: Statistics of diseases.

What is the newly developed drug for A: To produce a better and safer pregnancy. B: To enable woman to have multiple births. C: To balance the hormone. D: To test whether a woman is pregnant or not.

Nowadays the number of births, like the age of death, has become [u]average[/u].  A: 平均数 B: 通常的 C: 平均为 D: 正常标准

Infant _________rate is the number of infants dying before reaching one year of age, per 1,000 live births in a given year. A: mortality B: incidence C: disability D: survival

Spinal muscular atrophy (SMA)is diagnosed in approximately one out of every _________ live births and is the leading genetic cause of infant mortality. A: 8,000 B: 10,000 C: 12,000 D: 15,000

If a population of 100,000 have 2,000 births, 500 deaths, 100 immigrants, and 200 emigrants in one year, what is the growth rate? A: 2.0% B: 1.7% C: 1.6% D: 1.4% E: 0.4%