—Must I hand in my homework today?

—No, you _____. Tomorrow is OK.       [ ]

A. mustn't                    

B. wouldn't                   

C. can't                     

D. needn't

下列属于生物性状的是（　）

A．人的ABO血型

B．小麦的株高

C．猎豹的快速奔跑

D．以上三项都是