题目内容

English-speaking people usually greet each other in an()way

A. formal
B. informal
C. casual

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对里昂惕夫之谜有如下解释()

A. 劳动效率的差异
B. 人力资本的差异
C. 自然资源因素被忽略
D. 要素密集型逆转发生

There are four very ______ seasons in my hometown()

A. obvious
B. complete
C. beneficial

There is no need for us to use recycled paper.()

依据()理论,发达国家与发达国家之间的贸易需求更为强烈

A. 产品生命周期理论
B. 比较优势理论
C. 幼稚产业保护论
D. 重叠需求理论

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