that you are chosen to be a volunteer at the London Olympic Games, what will you do?

A．Assumed

B．Assuming

C．To assume

D．To be assumed

我国水产品中的寄生虫主要是（）。

A．囊虫和旋毛虫 

B．肝吸虫和肺吸虫 

C．肝吸虫和旋毛虫 

D．肺吸虫和囊虫