—David, your mother's birthday is _____. Let's think about how to celebrate it.

—OK, Dad. [ ]

A. coming up

B. picking up

C. closing down

D. looking up

远洋船舶载重线标志上的最低一条载重线是（）。

A．热带载重线

B．夏季载重线

C．北大西洋冬季载重线

D．冬季载重线