题目内容
Animal husbandry land could account for two thirds of the whole land area.
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is the birthplace of potato.
In the middle of 19th century, potatoes were attacked by a fungus which was called as “______”.
Malthus proposes that when the population growth exceeds the food growth by far, the food is severely not enough and large-scale population death will occur in his book .
At the beginning, Europeans could not accept potato as food, but only for viewing.
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