----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

办理( )的报检手续时，只需提供合同、发票、装箱单和提单。

A．从美国进口的裸装新设备
B．从加拿大进口的汽车
C．从以色列进口的化妆品
D．从巴西进口的有木托盘的钢轨