借记卡卡号的前（）位为上海银行的银行标示代码BIN。
A、四
B、五
C、六
D、七
参考答案：C
Allow children to voice their opinions, ____ they are different from your own. [ ]
A. until
B. even if
C. unless
D. as though
第二次技术革命发生在从（）
