题干
There will be a basketball game tomorrow in our school. Class 1 will play a____ Class 2.
答案(点此获取答案解析）
against
There will be a basketball game tomorrow in our school. Class 1 will play a____ Class 2.
均不产生进位现象,则称n为“良数”.例如:32是“良数”，因为32+33+34不产生进位现象；23不是“良数”，因为23+24+25产生进位现象.那么小于1000的“良数”的个数为 ( )
