单选题The population decreased from the 1840s until about 1970,largely because of（）.Aa low birth rateBa high death rateCa low employment rateDa high emigration rate
单选题
The population decreased from the 1840s until about 1970,largely because of（）.
A
a low birth rate
B
a high death rate
C
a low employment rate
D
a high emigration rate
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