题目内容
李嘉图解释了劳动生产率差异如何引起国际贸易，并进一步解释了造成各国劳动生产率差异的原因。（）
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英葡两国的相对劳动生产率如下：下述说法正确的是（ ）。
Rearrange the sentences to make a dialogue(将句子排序，组成一段对话).
1. Text-relatedComplete the passage with words chosen from the Words and Phrases to Drill box. Change the form where necessary.In his interview, Samuel Wood discusses the ____________ (1) of human cloning. It is, he freely admits, a _______________ (2) one. He personally does not approve of producing human __________ (3) for reproductive purposes. He is, however, very much in favour of cloning for therapeutic purposes, as he believes this has great ____________ (4) to provide new means to fight disease. Nonetheless, there are those who ____________ (5) human cloning in this area also. Partly this stems from _________________ (6) about what is involved, but partly the opposition comes from differences in deeply held values. Wood names the Pope and President Bush as two notable ____________ (7) of his work. Wood's own commitment to his research __________ _________ (8) the promise he made to himself to look for a cure to the disease from which his mother died. It was a promise that was later to lead him to __________ ___________ (9) in public as the first man to clone himself. This he did by transplanting one of his own cells into a ____________ (10) egg from which the genetic material had been removed.
H-O模型的中心论点就是一国将出口使用相对充裕的要素生产的产品，而进口使用相对稀缺的生产要素生产的产品。（ ）
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