— What do you plan ________ this weekend?
— We decide ________ to the beach.
A:to do; going
B:to do; to go
C:doing; to go
(Ⅰ)求乙投球的命中率p;
(Ⅱ)若甲投球1次,乙投球2次,两人共命中的次数记为ξ,求ξ的分布列和数学期望.
如图为人体某处的血管结构和血流方向示意图.下列有关叙述正确的是( )
—Can I park my car in front of the building?
—No, you ___________.
影响生物生活的环境因素( )