采用4位比较器7485对两个四位二进制数进行比较时，先比较___________位。（填入最高或最低，否则不得分）
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Do You charge for deliery?
A. 对
B. 错
I am writing to inquire about your travel plans in China
A. 对
B. 错
At the meeting he only echoed my arguments for gun control
A. 对
B. 错
It sounds like a marvelous idea . but I'm not sure if it is feasible
A. 对
B. 错
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