The population decreased from the 1840s until about 1970s, largely because of___

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问题 The population decreased from the 1840s until about 1970s, largely because of______.

选项 A、a low birth rate
B、a high death rate
C、a low employment rate
D、a high emigration rate

答案 D

解析从1846年末开始，移民达到了前所未有的规模，之后的10年间，180万人离开了爱尔兰，其中有100多万人是在饥荒期间移民的，这也是19世纪最重要的人口急剧下降的原因之一。

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Thepopulationdecreasedfromthe1840suntilabout1970s,largelybecauseof___