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

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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大学英语六级

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