本题目来源于试卷: Human Population Dynamics，类别为 IB环境系统与社会
[单选题]
Figure: Population statistics for countrizx 2tr( m nisns3az5 r;c0.x 0kv+k.jwes t r/ew+lp2,fqR and V
Country R Country V
Population 1,500,000 12,800,000
Births 1,500 15,000
Deaths 1,400 12,500
Crude birth rate CBR 1.17
Crude death rate CDR 0.98
Natural increase rate 0.007 NIR
Using the population statistics for country R and country C in the Figure, calculate the missing data.
A. CBR is 1 CDR is 0.93 NIR is 0.019
B. CBR is 0.1 CDR is 0.093 NIR is 0.19
C. CBR is 0.01 CDR is 0.0093 NIR is 1.9
D. CBR is 0.001 CDR is 0.00093 NIR is 19
参考答案: A
本题详细解析:
CBR=$\frac{births}{population}×1000$
=$\frac{1500}{1500000}×1000$
=1
CDR=$\frac{deaths}{population}×1000$
=$\frac{1400}{1500000}×1000$
=0.93
NIR=$\frac{CBR-CDR}{10}$
=$\frac{1.17-0.98}{10}$
=0.019%
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