Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate. The major agents of population growth are bir

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问题 Populations have 3 agents, namely, a birth rate, a death rate, and a growth rate.
The major agents of population growth are births and deaths.

选项 A、Y
B、N
C、NG

答案B

解析 参见文章第2句:The major agent of population growth is births,and the major agent of population loss is deaths.
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