给下面的问句选择合适的答语。( )(1)What do you like to do on Sunday?( )(2)Do you like to sing songs?( )(3)What day is it today?( )(4)Are they have PE in the afternoon?( )(5)What is your hand?( )(6)When do you go to bed?
若x表示一个两位数,y也表示一个两位数,小明想用x、y来组成一个四位数,且把x放在y的右边,你认为下列表达式中正确的是()
在代数式,0,,,,中,整式有()
下列运算正确的是()
下列各数:-6,-3.14,π,,0,0.212121,其中分数的个数有()
某种面粉包装袋上的质量标识为“25±0.5kg”,则下列四袋面粉中不合格的是()