单项选择题

As visitors come into the room, the presenter should __________.

A．first give the name card to them politely
B．wait for the questions when they come to the poster
C．take steps forward to attract them to the poster
D．stand quietly next to the poster and greet them

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判断题

离子导电时,往往同时存在正离子和负离子的导电。( )

答案：正确

单项选择题

支付资金清算系统主要指完成银行与客户之间的支付与结算的系统。

A.正确
B.错误