生物之间通过吃与被吃的关系形成食物链，下列能够完整的表示食物链的是[ ]

A．大鱼吃小鱼，小鱼吃虾米            

B．猫头鹰吃田鼠，田鼠吃庄稼

C．螳螂捕蝉，黄雀在后                

D．蛇吃田鼠，猫头鹰也吃田鼠

There is no alternative, the president must approve the bill if Congress passes it.

A. chance of agreement

B. doubt
C. other choice


D. mistake