One of the methods of introducing foreign genes into a plant is to make use of certain

soil bacteria to infect the plant and transfer several of blue genes to the infected plant

cells, _____ in high rate of plant cell pision.

A．results

B．resulting

C．to result

D．resulted

胆管结石常表现（）。

A.声且伴声影

B.胆管壁均匀性增厚

C.扩张的胆管突然中断并见软组织肿块

D.管呈囊性扩张的无回声区

E.胆管走行扭曲