—Dad, must I finish my homework today?

—No, you _____. You may do it tomorrow. [ ]

A. needn't

B. mustn't

C. don't

D. won't

与大气压力产生关系最密切的是（）。

A.基托面积

B.黏膜厚度

C.边缘封闭

D.后堤区宽度