By using bar codes developed By Wal-Mart, manufactures enjoyed more says over retailers.
A．Y
B．N
C．NG

A.
A．Y
B．N

【参考答案】

B
解析：第2个小标题Wal-Mart Strategy部分的第1段第3句：The bar allowed re......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)