单项选择题

商业习惯是职业习惯的一种，是指从事商业活动过程中逐渐养成的一种固定的思维模式或行事风格。

A．对
B．错

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证明：若B1，B2都与A可交换，则B1+B2，B1B2也都与A可交换．

单项选择题

During the Second World War about 30,000 Jewish people were given the safe asylum in Shanghai by Chinese people and escaped the atrocities of the Holocaust in Europe. One of them is Ho Fengshan (何凤山) who rescued thousands of Jews in Austria from the Holocaust by _________. A、providing secret passages to Shanghai B、hiring them in his factory C、issuing visas to Shanghai D、providing international safety zone in Vienna

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