----What do you know the _____ of are the pig influenza in humans?

---- usually similar to regular human seasonal influenza .

A．symptoms

B．sympathy

C．symbol

D．symptom

证券公司从事中间介绍业务的工作人员不得( )。

A．进行期货交易

B．做获利保证、共担风险等承诺

C．虚假宣传

D．误导客户