-- Could you tell me __________ yesterday?
-- Because my bike was broken on my way here.
A:why you came late
B:why do you come late
C:why you come late
D:why did you come late
深圳两名14岁的中学生——刘俊良和解松发起“把生日会办成筹集善款的聚会”的倡议。为了推广这一做法,他们开始搭建慈善捐助的平台,并付诸实际,开始了慈善公益活动。他们的行为( )①表明要胸怀天下,承担关爱社会的责任②表明参加公益活动是培养优秀品质的唯一途径③有利于彻底改掉生日浪费的行为习惯 ④表明服务社会要从日常生活做起
对命题p:A∩∅=∅,命题q:A∪∅=A,下列说法正确的是( )