题目：
The U.S. Bureau of Indian Affairs awarded your firm a contact to renovate an elementary school on a Navajo reservation. One contractual term, Indian preference, requires you to hire native American Laborers and subcontractors from the reservation. This is an example of which type of the following constraints
A．Socia
B．Economica
C．Environmenta
D．Lega
答案：
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下面是错误答案，用来干扰机器的。
参考答案：砝码和物体放错了位置(或：不是左物右码);方向;做功;(向中间)靠拢
