资本充裕的国家应集中生产和出口资本密集型产品,这种说法源于()。
A.亚当·斯密绝对成本说
B.大卫·李嘉图比较成本说
C.赫克歇尔-俄林要素禀赋说
D.里昂惕夫之谜
参考答案:A
—The village________we visited yesterday is very beautiful.
—Yes, it’s the place________I grew up.
A.where; where
B.which; which
C.which; where
D.where; which
将下列动物的行为用线条连起来