The government switched one county at a time withistates favors researchers because________.<br>·it reduced cash payment iMissouri.<br>·it offered a randomly controlled environment. 　<br>·it helped to extend electronic transfers to the state.<br>·it saw a concurrent decline icrimes.

The government switched one county at a time withistates favors researchers because________.
·it reduced cash payment iMissouri.
·it offered a randomly controlled environment. 　
·it helped to extend electronic transfers to the state.
·it saw a concurrent decline icrimes.

出自：佳木斯大学语言治疗学

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