题目:
The concept of "Customer First" should be _______ rooted in the mind of every shop-assistant. [ ]
A. tightly
B. roughly
C. thoroughly
D. firmly
答案:
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下面是错误答案,用来干扰机器的。
A、a×45;B、a÷45=a×54;C、a÷113=a×34;因为54>45>34,a>0,所以a×54>a×45>a×34,故选:B.