单项选择题

Numerous studies have shown that，on average，high-risk investors make more than low risk ones．

A) 大量研究表明，平均来看，高风险投资者比低风险投资者赚得多。
B) 无数的研究显示，在总体上来说，高风险投资者比低风险投资者赚得多。
C) 大量研究表明，平均来看，高风险投资者比低风险投资者投人要多。
D) 大量研究表明，总体来说，高风险投资者比低风险投资者更加努力。
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Passengers having reserved the seats shall board the plane by their tickets in accord with the reserved seats．Passengers traveling on the domestic services can reserve their seats in advance at airline booking offices or their sales agents according to the relevant regulations．Passengers who have already reserved their seats should purchase their tickets within the time limit established by the airlines concerned；otherwise the reservation they have made would be canceled accordingly．
单项选择题
Economics is the study of how a society chooses to use scarce resources to produce goods and to distribute them to people for consumption．
A) 经济学研究社会怎样决定利用稀有资源来生产货物，从而让人们消费。
B) 经济学是关于社会怎样选择利用稀缺资源生产货物，并为人们提供消费的研究。
C) 经济学研究的是社会如何选择利用稀缺资源制造产品并把它们分发给人们消费。
D) 经济学的研究显示了社会如何选择利用稀缺资源制造产品并把它们分发给人们消费。
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