The government switched one county at a time within states favors researchers because _____

A．it reduced cash payment in Missouri

B．it offered a randomly controlled environment

C．it helped to extend electronic transfers to the state

D．it saw a concurrent decline in crimes

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参考答案

细节题。根据题干关键词定位到第六段。本段提到This created a kind of…for the researchers…。即政府在州内一次更新一个县的系统，这项举措很巧合地为研究人员提供了一个受控环境。以方便进行减少现金使用是否会使犯罪率下降的研究，因此，正确答案是B。

1 The shift away from cash in Missouri´ s counties resulted in ____

A．an unobvious decrease in the overall crime rate

B．a decrease in certain crimes such as robbery and rape

C．a decline in crimes related to the use of cash

D．a decline in overall crimes

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2 It can be learned from the last paragraph that ____

A．the government is advised to advocate cashless payments

B．America has become a cashless society

C．most, people now send their friends money by email

D．it is absurd to fight against crime by using Visa, Square, and Google Wallet

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3 Which of the following would be the most appropriate title for this text?

A．Why has Crime in America Declined since the 1990s

B．How the Decline of Cash Makes America a Safer Country

C．The Impacts of the Decline of Cash in America

D．The Relations between Cash and Crime

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