裸子植物和被子植物的共同特征是（）。

A.多为草本植物

B.都有种子

C.都有果实

D.种子外面有果皮包被着

To prevent a wooden hull from leaking you caulk it（）.

A.after drydocking，while the hull is moist

B.after drydocking，and the hull has dried

C.afloat，where it is leaking

D.afloat，in all accessible areas